I need help please. Which of the following expressions are equivalent to 7x + 14 − 3x + 12?

1. 21x + 8x

2. 7x − 3x + 14 + 12

3. 4x + 14 + 12

4. 4x − 2

5. 7x + 26 − 3x

I just did this quetio with the tutor the answers are 2, 3, and 5.

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

a

step-by-step explanation: