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WB JEE

Quadratic Equations

Mathematics

Previous Years Questions

MCQ (Single Correct Answer)

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The value of a for which the sum of the squares of the roots of the equation $${x^2} - (a - 2)x - a - 1 = 0$$ assumes th...
WB JEE 2022
If a, b are odd integers, then the roots of the equation $$2a{x^2} + (2a + b)x + b = 0$$, $$a \ne 0$$ are
WB JEE 2022
Let $$\alpha$$, $$\beta$$ be the roots of the equation x2 $$-$$ 6x $$-$$ 2 = 0 with $$\alpha$$ > $$\beta$$. If an = $$\a...
WB JEE 2021
If P(x) = ax2 + bx + c and Q(x) = $$ - $$ax2 + dx + c, where ac $$ \ne $$ 0 [a, b, c, d are all real], then P(x).Q(x) = ...
WB JEE 2020
Let z1 and z2 be two imaginary roots of z2 + pz + q = 0, where p and q are real. The points z1, z2 and origin form an eq...
WB JEE 2020
The expression ax2 + bx + c (a, b and c are real) has the same sign as that of a for all x if
WB JEE 2020
If $$\alpha$$ and $$\beta$$ are the roots of the equation x2 + x + 1 = 0, then the equation whose roots ar $$\alpha$$19 ...
WB JEE 2011
If the ratio of the roots of the equation $$p{x^2} + qx + r = 0$$ is $$a:b$$, then $${{ab} \over {{{(a + b)}^2}}}$$ =...
WB JEE 2011
Let a, b, c be three real numbers such that a + 2b + 4c = 0. Then the equation ax2 + bx + c = 0
WB JEE 2011
If sin $$\theta$$ and cos $$\theta$$ are the roots of equation ax2 $$-$$ bx + c = 0, then a, b and c satisfy the relatio...
WB JEE 2011
The quadratic equation $${x^2} + 15|x| + 14 = 0$$ has
WB JEE 2010
The roots of the quadratic equation $${x^2} - 2\sqrt 3 x - 22 = 0$$ are
WB JEE 2010
If $$\alpha$$, $$\beta$$ be the roots of the quadratic equation x2 + x + 1 = 0 then the equation whose roots are $$\alph...
WB JEE 2010
If a, b, c are real, then both the roots of the equation $$(x - b)(x - c) + (x - c)(x - a) + (x - a)(x - b) = 0$$ are al...
WB JEE 2009
The quadratic equation whose roots are three times the roots of $$3a{x^2} + 3bx + c = 0$$ is
WB JEE 2009
The sum of all real roots of the equation $$|x - 2{|^2} + |x - 2| - 2 = 0$$ is
WB JEE 2009
If $$\alpha$$, $$\beta$$ be the roots of $${x^2} - a(x - 1) + b = 0$$, then the value of $${1 \over {{\alpha ^2} - a\alp...
WB JEE 2009
The equation $${x^2} - 3|x| + 2 = 0$$ has
WB JEE 2008
If one root of the equation $${x^2} + (1 - 3i)x - 2(1 + i) = 0$$ is $$-$$1 + i, then the other root is
WB JEE 2008

Subjective

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Determine the sum of imaginary roots of the equation $$(2{x^2} + x - 1)(4{x^2} + 2x - 3) = 6$$
WB JEE 2011
Find the values of a for which the expression $${x^2} - (3a - 1)x + 2{a^2} + 2a - 11$$ is always positive.
WB JEE 2009

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