Question

Evaluate the expression for the given value of the variable(s). -x2 - 4x; x = -3 Question 4 options:

Answer 1

-x^2-4x
x=-3→-(-3)^2-4(-3)=-9+12=3

Answer: 3

Answer 2

ANSWER

The value of the expression is
$3$



EXPLANATION

The given expression is

$- {x}^{2} - 4 x$

We want to evaluate this expression at

$x = - 3$

This means that, we have to substitute -3 wherever we see x in the given expression.


This will give us,

$- ( { - 3)}^{2} - 4( - 3)$

We evaluate the first parenthesis to get,
$- 9 - 4( - 3)$


We now multiply the second parenthesis to get,

$- 9 + 12$

This is the same as,

$12 - 9 = 3$