Question

If f(x) = 5x + 40, what is f(x) when x = –5? –9 –8 7 15

Answer 1

Hi,

$f(x)=5x+40\\\\f(-5)=5\times(-5)+40=-25+40=15\\f(-9)=5\times(-9)+40=-45+40=-5\\f(-8)=5\times(-8)+40=-40+40=0\\f(7)=5\times7+40=35+40=75\\f(15)=5\times15+40=75+40=115$

Answer 2

The Answer is 15. You're welcome kidz
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