Question

How do you evaluate the expression `2x^2+3x+9` if x=-3?

Answer 1

`18`

Explanation:

You substitute `-3` for every occurrence of `x` in the expression and then calculate the result. Be sure to handle the signs of numbers correctly:

`2(-3^2) + 3(-3) + 9 ->`

`(2*9) - 9 + 9 ->`

`18 - 0 ->`

`18`