Monday 10 July 2017

FUNCTIONS 3


If F(x) = 2x2 - 5. Find F(-3)

Solution

F(x) = 2x2 - 5.

F(-3) = 2(-3)2 -5

F(-3) = [2 x 9] -5       since (-3)2 =9

F(-3) = 18 -5

F(-3) = 13

Hence  F(-3) = 13

TRY THIS………………………………


If F(x) = 3x2 - 8. Find F(-4) 

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