Question

Evaluate -4a^2+2a-1 when a=3.

Answer 1

Answer: -31

Explanation:

4(3)^2+2(3)−1

Calculate 3 to the power of 2 and get 9.

−4×9+2×3−1

Multiply −4 and 9 to get −36.

−36+2×3−1

Multiply 2 and 3 to get 6.

−36+6−1

Add −36 and 6 to get −30.

−30−1

Subtract 1 from −30 to get −31.

−31

Answer 2

-35

Explanation:

`-4a^(2) +2a-1`

Now we substitute and simplify:

`-4(3)^(2) +2(3)-1`

`-4(9)+6-1`

`-36+6-1`

`-36+5`

-35 is our final answer