Select all the equations that are true when x = 6. 6x = 12 17 – x = 11 x ÷ 2 = 3 19 ÷ 3 = x 5 + x = 11

We are given –

In case of 1st equation –

In case of 2nd equation –

In case of 3rd equation –

In case of 4th equation –

In case of 5th equation –

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