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What will be the value of f(x) if, 2A, A + B, C are integers and f(x) = Ax^2 + Bx + C = 0?(a) Natural Number(b) Unpredictable(c) Integer(d) Complex NumberThe question was asked in semester exam.This intriguing question comes from Applications of Quadratic Equations topic in chapter Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer» CORRECT choice is (c) Integer

Explanation: F(x) = Ax^2 + BX + C = 0

So, f(x) = Ax^2 + (A + B)x – Ax + C

= Ax^2 – Ax + (A + B)x + C

= 2Ax(x – 1)/2 + (A + B)x + C

Therefore, f(x) is an integer.


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