Question

If f(x) = 2(x²+5), then f(-3) =_.

Answer 1

Given

`f(x)=2(x^2+5)`

Set x=-3 and solve for f(-3), as shown below

`\Rightarrow f(-3)=2(-3^2+5)=2(9+5)=2(14)=28`

The answer is f(-3)=28