Question

5x-4[7+(2x-4)], for x=-3
with shown work please

Answer 1

5×(－3)－4{7＋[2×(－3)－4]}
－15－4[7＋(－6－4)]
＝－15－4[7＋(－10)]
＝－15－4(7－10)
＝－15－4×(－3)
＝－15＋12
＝－3

Hope my answer helped u :)

Answer 2

Answer: -3

Concept:

Here, we need to understand the idea of evaluation.

When encountering questions that gave you an expression with variables, then stated: "If x = a, y = b, z = c" (a, b, c are all constants), this means you should substitute the value given for each variable back to the expression.

Solve:

Given information

x= -3

Given expression

5x - 4 [7 + (2x - 4)]

Substitute x value into the expression

=5(-3) - 4 [7 + (2(-3) - 4)]

Simplify by multiplication

=-15 - 4 [7 + (-6 - 4)]

Simplify value in parentheses

=-15 - 4 [7 + (-10)]

Simplify value in bracket

=-15 - 4 [-3]

Simplify by multiplication

=-15 - (-12)

=-15 + 12

=
`\boxed{-3}`

Hope this helps!! :)

Please let me know if you have any questions