Answer:
Step-by-step explanation:
1) f(x) = 7 - 8x²
f(3) = 7 - 8*3²
= 7 - 8*9
= 7 - 72
f(3) = -65
2) f(a) = -5(a-2)
f(3) = -5(3 -2) = -5 * 1 = -5
[tex]3)f(h) =\dfrac{-h}{72}\\\\\\f(3)=\dfrac{-3}{72}=\dfrac{-1}{24}[/tex]
4) f(m) = m(m +4)
f(3) = 3*(3+4) = 3 * 7 = 21
