f(x) = 15 + 5x - 8x
= 15 + (-3x)
= 15 - 3x
f(5) = 15 - 3(5)
= 15 - 15
by: Annafa
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f(x) = 15 + 5x - 8x
= 15 + (-3x)
= 15 - 3x
f(5) = 15 - 3(5)
= 15 - 15
= 0
by: Annafa