Find the range of the function defined by .

MATHEMATICS · Single correct · A Level · Mathematics · Algebra and Functions · Algebra and Functions

Problem

Find the range of the function f:R→Rf:\mathbb R\to\mathbb R defined by f(x)=2x2−8x+5f(x)=2x^{2}-8x+5. (a) (−∞,−3](-\infty,-3] (b) [−8,∞)[-8,\infty) (c) [−3,∞)[-3,\infty) (d) [3,∞)[3,\infty)

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