JAMB - Mathematics (1993 - No. 16)
If the function f is defined by f(x + 2) = 2x\(^2\) + 7x - 5, find f(-1)
-10
-8
4
10
説明
f(x + 2) = f(-1)
f(-1) is gotten when x = -3.
\(2x^{2} + 7x - 5\) at x = -3.
f(-1) = \(2(-3)^{2} + 7(-3) - 5\)
= \(18 - 21 - 5 = -8\)