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Basic Maths

25 JEE Maths previous year questions on Basic Maths — options free on every question; 2 include the answer & explanation free, the rest unlock with PYQ Pass.

Q1 FREE PREVIEW
PYQ

If the set of all solutions of \(|{x}^{2}+x-9|=|x|+|{x}^{2}-9|\)is \([\alpha ,\beta ]\cup [\gamma ,\infty ),\) then \(\left({\alpha }^{2}+{\beta }^{2}+{\gamma }^{2}\right)\) is equal to:

[JEE Main 2026, 4 Apr (Shift 1)]

a

\(9\)

b

\(18\)

c

\(36\)

d

\(72\)

✓ Correct answer: b)

\(18\)

Explanation

We know if \( |\mathrm{a}|+|\mathrm{b}|=|\mathrm{a}+\mathrm{b}|\)
Then \( \mathrm{a} \cdot \mathrm{~b} \geq 0 \)
\( \Rightarrow \mathrm{x}\left(\mathrm{x}^2-9\right) \geq 0\)
\( \mathrm{x} \in[-3,0] \cup[3, \infty)\)
\( \alpha^2+\beta^2+\gamma^2=18\)

Q2 FREE PREVIEW
PYQ

The sum of the squares of the roots of \(|x-2{|}^{2}+|x-2|-2=0\) and the squares of the roots of \({x}^{2}-2|x-3|-5=0\), is

[JEE Main 2025, 8 Apr (Shift 1)]

a

26

b

36

c

30

d

24

✓ Correct answer: b)

36

Explanation

\(|x−2{|}^{2}+|x−2|−2=0\)

\((|x−2|+2)(|x−2|−1)=0\)

\(|x−2|+2=0,\text{ }|x−2|−1=0\)

(not possible), \(|x−2|=1\)

\(x=2\pm 1\)

\(x=3,1\)

and \({x}^{2}−2(x−3)−5=0\)

\(\text{Case I:-  }x\text{ }⩾\text{ }3\)

\({x}^{2}−2x+6−5=0\)

\({(x−1)}^{2}=0\)

\(x=1\) (not possible)

\(\text{Case II:-  }x\text{ }<\text{ }3\)

\({x}^{2}+2x−6−5=0\)

\({x}^{2}+2x−11=0\)

Let \(\alpha ,\beta\) be the roots of this equation then

\({\alpha }^{2}+{\beta }^{2}={(\alpha +\beta )}^{2}−2\alpha \beta\)

\(={(−2)}^{2}−2(−11)=4+22=26\)

Sum of the squares of the roots \(={3}^{2}+{1}^{2}+26=36\)

Q3
PYQ

The number of real roots of the equation \(\mathrm{x}|\mathrm{x}-2|+3|\mathrm{x}-3|+1=0\) is :

[JEE Main 2025, 7 Apr (Shift 2)]

a

\(4\)

b

\(2\)

c

\(1\)

d

\(3\)

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Q4
PYQ

The sum of all the real solutions of the equation \(\log _{(x+3)}\left(6 x^2+28 x+30\right)=5-2 \log _{(6 x+10)}\left(x^2+6 x+9\right)\) is equal to

[JEE Main 2026, 23 Jan (Shift 2)]

a

\(1\)

b

\(2\)

c

\(0\)

d

\(4\)

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Q5
PYQ

The sum of the squares of the roots of \(|x-2{|}^{2}+|x-2|-2=0\) and the squares of the roots of \({x}^{2}-2|x-3|-5=0\), is

[JEE Main 2025, 8 Apr (Shift 1)]

a

26

b

36

c

30

d

24

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Q6
PYQ

The product of all real solutions of the equation \({e}^{5{\left({\log }_{e}x\right)}^{2}+3}={x}^{8},x>0,\) is:

[JEE Main 2025, 22 Jan (Shift 1)]

a

\({e}^{\frac{8}{5}}\)

b

\({e}^{\frac{6}{5}}\)

c

\({e}^{2}\)

d

\(e\)

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Q7
PYQ

\(e^{5(\ln x)^2+3}=x^8 \text {. Product of all real values of } \mathrm{x} \text {. }\)

a

\(e\)

b

\({e}^{\frac{3}{5}}\)

c

\({e}^{\frac{8}{5}}\)

d

None of these

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Q8
PYQ

If \({e}^{5\text{ }{\left(\ln \text{ }x\right)}^{2}+3}={x}^{8}\) then product of all real values of \(x.\)

a

\(e\)

b

\({e}^{\frac{3}{5}}\)

c

\({e}^{\frac{8}{5}}\)

d

None of these

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Q9
PYQ

If the domain of the function \(f\left(x\right)={\text{log}}_{\left(10{x}^{2}−17x+7\right)}\left(18{x}^{2}−11x+1\right)\) is \(\left(−∞,a\right)\cup \left(b,c\right)\cup \left(d,∞\right)−\left\{e\right\}\), then \(90\left(a+b+c+d+e\right)\) equals:

[JEE Main 2026, 24 Jan (Shift 1)]

a

\(316\)

b

\(307\)

c

\(177\)

d

\(170\)

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Q10
PYQ

The number of distinct real solutions of the equation \(x\left|x+4\right|+3\left|x+2\right|+10=0\) is

[JEE Main 2026, 22 Jan (Shift 1)]

a

\(2\)

b

\(0\)

c

\(1\)

d

\(3\)

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Q11
PYQ

The sum of the squares of the roots of \(|x-2{|}^{2}+|x-2|-2=0\) and the squares of the roots of \({x}^{2}-2|x-3|-5=0\), is

[JEE Main 2025, 8 Apr (Shift 1)]

a

26

b

36

c

30

d

24

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Q12
PYQ

The sum of the squares of the roots of \(|x-2{|}^{2}+|x-2|-2=0\) and the squares of the roots of \({x}^{2}-2|x-3|-5=0\),

JEE MAINS [2025]

a

26

b

36

c

30

d

24

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Q13
PYQ

The number of real roots of the equation \(x|x-2|+3|x-3|+1=0\) is:

[JEE Main 2025, 7 Apr (Shift 2)]

a

\(4\)

b

\(2\)

c

\(1\)

d

\(3\)

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Q14
PYQ

The number \( \log _{2} 7 \) is

JEE MAINS [2023]

a

an integer

b

a rational number

c

an irrational number

d

a prime number

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Q15
PYQ

The sum of the roots of the equation, \(x+1-2{\log }_{2}\left(3+{2}^{x}\right)+2{\log }_{4}\left(10-{2}^{-x}\right)=0\), is:

[JEE Main 2021, 31 Aug (Shift 2)]

a

\({\log }_{2}12\)

b

\({\log }_{2}13\)

c

\({\log }_{2}11\)

d

\({\log }_{2}14\)

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Q16
PYQ

Solution of \(2^x+2^{|x|} \geq 2 \sqrt{2}\) is :

a

\(\left(-\infty, \log _2(\sqrt{2}+1)\right)\)

b

\((0, \infty)\)

c

\(\left(\frac{1}{2}, \log _2(\sqrt{2}-1)\right)\)

d

\(\left(-\infty, \log _2(\sqrt{2}-1)\right] \cup\left[\frac{1}{2}, \infty\right)\)

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Q17
PYQ

Let \( S \) be the set of all real roots of the equation, \( 3^{x}\left(3^{x}-1\right)+2=\left|3^{x}-1\right|+\left|3^{x}-2\right| \). Then \( S \):


[JEE Main 2020, 8 Jan (Shift 2)]

a

singleton set

b

two elements

c

at least four elements

d

infinite elements

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Q18
PYQ

The number of integral solutions x of \({\log }_{\left(x+\frac{7}{2}\right)}{\left(\frac{x-7}{2x-3}\right)}^{2}\geq 0\) is ________ .

[JEE Main 2023, 11 Apr (Shift 1)]

a

6

b

8

c

5

d

7

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Q19
PYQ

The number of elements in the set \( \{x \in \mathbb{R}:(|x|-3)|x+4|=6\} \) is equal to

[JEE Main 2021, 16 Mar (Shift 1)]

a

3

b

2

c

4

d

1

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Q20
PYQ

The number \( \log _{2} 7 \) is

a

an integer

b

a rational number

c

an irrational number

d

a prime number

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Q21
PYQ

If \(\left|3x−5\right|\text{ }\leq \text{ }2,\) then

a

\(−1\leq x\leq \frac{7}{3}\)

b

\(1\leq x\leq \frac{9}{3}\)

c

\(1\leq x\leq \frac{7}{3}\)

d

\(−1\leq x\leq \frac{9}{3}\)

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Q22
PYQ

The number of real roots of the equation \(x|x|-5|x+2|\) \(+6=0\), is

[JEE Main 2023, 15 Apr (Shift 1)]

a

5

b

3

c

6

d

4

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Q23
PYQ

The number of integral solutions of

\( \log _{\left(x+\frac{7}{2}\right)}\left(\frac{x-7}{2 x-3}\right)^{2} \geq 0 \)

[JEE Main 2023, 11 Apr (Shift 1)]

a

\( 8 \)

b

\( 7 \)

c

\( 5 \)

d

\( 6 \)

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Q24
PYQ

The number of real solutions of the equation, \({x}^{2}-|x|-12=0\text{ }\)

[JEE Main 2021, 25 Jul (Shift 2)]

a

2

b

3

c

1

d

4

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Q25
PYQ

The sum of the roots of the equation \(x+1-2{\log }_{2}\left(3+{2}^{x}\right)+2{\log }_{4}\left(10-{2}^{-x}\right)=0\) is-

[JEE Main 2021, 31 Aug (Shift 2)]

a

\(\log _2 12\)

b

\(\log _2 13\)

c

\(\log _2 11\)

d

\(\log _2 14\)

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