Simplify -7x + 6y - 2x + 7x - 9x

-11 + 6y

Explanation:

First you need to group like terms.

-7x - 2x + 7x - 9x + 6y

Then you need to combine the similar elements.

-7x - 2x + 7x - 9x = -11x

Then the only two numbers you have left are -11x and 6y.

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The answer would be: 6y - 11x

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

c

step-by-step explanation: