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JEE Main 20265 AprilEvening Shift
Exam
JEE Main
Year
2026
Date
5 April
Shift
Evening Shift
Subject
Mathematics
Chapter
Quadratic Equation

JEE Main 2026 · 5 April · Evening Shift · Mathematics · Quadratic Equation

Let α, β be the roots of the equation x^2 - x + p = 0 and γ, be the...

Let α,β\alpha, \beta be the roots of the equation x2−x+p=0x^2 - x + p = 0 and γ,δ\gamma, \delta be the roots the equation x2−4x+q=0x^2 - 4x + q = 0; p,q∈Zp, q \in \mathbf{Z}. If α,β,γ,δ\alpha, \beta, \gamma, \delta are in G.P., then ∣p+q∣|p + q| equals :

Options

  1. A1616
  2. B3232
  3. C3434
  4. D3838

Correct answer

C. 3434

Step-by-step solution

Let α=a,β=ar,γ=ar2,δ=ar3\alpha = a, \beta = ar, \gamma = ar^2, \delta = ar^3 be the terms of the G.P.

From the given quadratic equations, the sum of the roots are:

α+β=1⇒a(1+r)=1\alpha + \beta = 1 \Rightarrow a(1 + r) = 1

γ+δ=4⇒ar2(1+r)=4\gamma + \delta = 4 \Rightarrow ar^2(1 + r) = 4

Dividing the second equation by the first equation:

ar2(1+r)a(1+r)=41\dfrac{ar^2(1 + r)}{a(1 + r)} = \dfrac{4}{1}

r2=4⇒r=2r^2 = 4 \Rightarrow r = 2 or r=−2r = -2

If r=2r = 2, then a(1+2)=1⇒a=13a(1 + 2) = 1 \Rightarrow a = \dfrac{1}{3}.

The product of the roots of the first equation is p=αβ=a2r=(13)2×2=29p = \alpha \beta = a^2 r = \left(\dfrac{1}{3}\right)^2 \times 2 = \dfrac{2}{9}. Since p∈Zp \in \mathbf{Z}, r=2r = 2 is rejected.

If r=−2r = -2, then a(1−2)=1⇒a=−1a(1 - 2) = 1 \Rightarrow a = -1.

The product of the roots of the first equation is p=αβ=a2r=(−1)2×(−2)=−2p = \alpha \beta = a^2 r = (-1)^2 \times (-2) = -2.

The product of the roots of the second equation is q=γδ=(ar2)(ar3)=a2r5=(−1)2×(−2)5=−32q = \gamma \delta = (ar^2)(ar^3) = a^2 r^5 = (-1)^2 \times (-2)^5 = -32.

Both pp and qq are integers, which satisfies the given condition.

Therefore, ∣p+q∣=∣−2−32∣=∣−34∣=34|p + q| = |-2 - 32| = |-34| = 34.

Answer: 3434
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