Question

If y = x2 + 2x , find the value of y when x = 3

and
If y = x3 - 3 , find the value of y when x = 2 plsss help me

Answer 1

y=15; y=5

Explanation:

y=x2+2x

plug in x as 3:

y=3 2+ 2*3

y=9+6

y=15

Next problem:

y=x3-3

plug in x as 2:

y=2 3-3

y=8-3

y=5