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tmua.me Medium Set B Paper 1 · Q1

Paper 1Functions & graphs

The function ff is defined by

f(x)=2x2−3x+1.f(x)=2x^2-3x+1.

A real number aa satisfies f(a+1)−f(a)=9f(a+1)-f(a)=9.

What is the value of f(a−1)−f(a)f(a-1)-f(a)?

A−13-13
B−9-9
C−5-5
D55
E1313

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