Home > PC3 > Chapter 1 > Lesson 1.1.5 > Problem1-46

1-46.

Let $f(x)=2x^2-3$. Evaluate:

1. $f(3b)$

Use ( ) when substituting to avoid errors.

$f(3b)=2(3b)^2-3$

1. $f(a+1)$

Do not forget the middle term when rewriting $(a+1)^2$.

$2a^2+4a−1$