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Question

If f(x) = (x - 2)(x 2+ Px + 4) and (x - 3) is a factor of f(x), then what is the value of P?

This question was previously asked in
SSC CGL 2017 (Tier 1) Previous Year Paper (16-Aug-2017) (Shift 1)
The correct answer is

-13/3

By the Factor Theorem, \((x-3)\) is a factor of \(f(x)\) iff \(f(3)=0\).

\[f(3)=(3-2)(9+3P+4)=13+3P=0\]

Solving: \(P=-\dfrac{13}{3}\).

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