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Answer = 59
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Known
f(x) = 2x² + 9
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Question
f(-5) = ?
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Way to do
#as you the x inside the (x) changed into (-5) it means that you need to change the x into -5.
f(-5) = 2(-5)² + 9
= 2 × 25 + 9
= 50 + 9 = 59
#So f(-5) = 59
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