WAEC 2022 · Paper 1 · Q39

Functions

If $f(x - 1) = x^3 + 3x^2 + 4x - 5$ , find $f(2)$ .

Worked solution (try it first)

$f(2)$ needs $x - 1 = 2$ , so $x = 3$ .
Put $x = 3$ into the right side: $27 + 27 + 12 - 5$ .
So $f(2) = 61$ , option A.

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