What is the value of the expression -3x^2 + 4x when x=-5

I believe the answer is -95. Substitute the value of the variable into the equation and simplify 

The answer would be -95.
When you plug -5 into the expression, it would look like this: -3(-5)^2 +4(-5)
Then, you solve as according to PEMDAS. First, you would (-5)^2 since there are no expressions in parentheses (does not count if the parentheses are showing multiplication) which would simplify to 25. Then, you do multiplication, starting from left to right which would simplify the expression to -75-20. Finally, you add the two remaining numbers and you get a final answer of -95.

Ais the answer for your question