Write each equation in the form of ax²+bx+c=0 and identify the values of a, b c. 1. x² -7x = -1
2. -3x + 2= 4x²
3. 6 + 3x²= -3x
4. 2x² = 9
5. 9x² - 5x = 5
6. 2(3x + 5) = x²
7. 3 ( x - 2)²= 6
8. 8x² + 3 = -4x
9. 2x - 3 = 2( x - 1 )²
10. 6 = ( 3x + 1 )²
11. ( x - 8)(x + 5 ) = 14
12. (x - 4)² + 8 = 0
13. (2x + 7)(x - 1 ) = 0
14. (x + 7)(x - 7) = -3x
15. 2x( x - 3) = 15

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step-by-step explanation:

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

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