ALGEBRA D1 1.(x+5)-(8x+8)
2.(6y-6x)-(7x+6y)

ASAP ANSWER THIS 2ST ANSWER I'LL MARK BRAINLIEST

1. -3 - 7x 2. - 13x

Step-by-step explanation:

1.

x+5-8x-8

-3 - 7x

2.

6y-6x-7x-6y

-13x

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15