Question

Simplify and then find the value of the expression when x = -1

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Answer 1

Answer:

The value of the expression at  $x=-1$  is 8.

Step-by-step explanation:

The given expression is

$(x^2-3x-4)-(4x+2)-2(x-2)$

First, we can expand the brackets.

$x^2-3x-4-4x-2-2x+4$

Add the like terms and simplify the above expression.

$x^2+x(-3-4-2)+(-4-2+4)=x^2-9x-2$

Now the value of the expression at $x=-1$ is obtained by substituting -1 to $x$ in the above-simplified expression.

$(-1)^2-9(-1)-2=1+9-2=8$

So the value of the expression at  $x=-1$  is 8.