Question

If 2x-1 = 13, evaluate the expression below. -x^2-4x
Explain please.

Answer 1

-77

Explanation:

-x^2-4x to
`-7^(2)`- ( 4 × 7)

-7^2 - ( 4 × 7)

-49 - ( 4 × 7)

-49 -28

=

-77

Answer 2

Answer: -77

Explanation:

2x - 1 = 13

Add 1 on both sides

2x = 14

x = 7

Substitute x to 7

-(7)^2 -4(7)

Solve

-49 - 28 = -77