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If (f(x)=8-(x-4)^2), what is the maximum value of (f(x))?

Answer and explanation

Correct answer: (8)

The direct answer is B, 8. A square can never be negative, so \\(x-4\\)^2\\ge0\\). Therefore subtracting it from 8 gives \\(8-(x-4)^2\\le8\\). Equality, and hence the maximum, occurs when \\(x-4=0\\), so \\(x=4\\) and \\(f(4)=8\\). Option A, 4, is the x-value where the maximum occurs, not the maximum function value. Option B, 8, is correct because it is the greatest possible output. Option C, 12, is impossible because a nonnegative square cannot make the expression larger than 8. Option D, 0, can occur when \\((x-4)^2=8\\), but it is not the maximum. Memory cue: in \\(a-(x-h)^2\\), the maximum is \\(a\\) at \\(x=h\\).

Related tags

Real-Valued-FunctionsMaximum-ValueQuadratic

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