3 years ago

X^2 + 6x = - 9 User:

1 answer:

3 0

X² + 10x + 25 = 16

x² + 10x + 25 - 16 = 0
x² + 10x + 9 = 0

(x + 1)(x + 9) = 0

x(x+9) + 1(x+9) = 0
x² + 9x + x + 9 = 0
x² + 10x + 9 = 0

(x + 1) = 0
x = -1

(x + 9) = 0
x = -9

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