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If the function f is defined by f(x + 2) = 2x\(^2\) + 7x - 5,...

Mathematics
JAMB 1993

If the function f is defined by f(x + 2) = 2x\(^2\) + 7x - 5, find f(-1)

  • A. -10
  • B. -8
  • C. 4
  • D. 10
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Correct Answer: Option B
Explanation

f(x + 2) = f(-1)

f(-1) is gotten when x = -3.

\(2x^{2} + 7x - 5\) at x = -3.

f(-1) = \(2(-3)^{2} + 7(-3) - 5\)

= \(18 - 21 - 5 = -8\)


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