Answer
a) $30h+5h^2$
b) 30+5h
Work Step by Step
a) $f(3)=5\times3^2=45$
$f(3+h)=5\times(3+h)^2=5(9+6h+h^2)=45+30h+5h^2$
$45+30h+5h^2-45= 30h+5h^2$
b) $\frac{30h+5h^2}{3+h-3}=\frac{30h+5h^2}{h}=30+5h$
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