Question

Evaluate the expression for the given value of the variable(s).

-x 2 - 4x; x = -3

A. 11
B. 3
C. -17
D. -1

Answer 1

\[-x ^{2}-4x; x=-3\]

Answer 2

\[-3^{2}-4*-3\]

Answer 3

i keep getting 21 but 21 isn't an answer choice

Answer 4

For example, if I want to evaluate:
\(\color{#000000}{ \displaystyle -x^2-4x;\quad {\rm at}~~~x=-2 }\)

Plug in x=-2 into the expression.
\(\color{#000000}{ \displaystyle -(-2)^2-4(-2)= -(4)-(-8) =-4+8=-4 }\)

Answer 5

\[-3^{2}-4*-3\]
\[(-3^2)-4(-3)\]
\[(9)-4(-3)\]

right so far?

Answer 6

No, you are missing something

Answer 7

I will point out the correction in red.
\(\color{#000000}{ \displaystyle \color{red}{-(-3)^2 }-4(-3) }\)

Answer 8

ooooooh so -9

Answer 9

so the answer is b?

Answer 10

Yes, B is the correct answer.

Answer 11

thank you!

Answer 12

\(\color{#0a00c0}{ \displaystyle -(-3)^2-4(-3) =-(9)-(-12) =-9+12=3 }\)