Solve the equation. x2 + 8x - 9 = 0 A) x = 1 B) x = 9 C) x = 9 or x = - 1 D) x = - 9 or x = 1

Question

Mathematics

Josiah Chan

3 June, 06:56

Solve the equation. x2 + 8x - 9 = 0 A) x = 1 B) x = 9 C) x = 9 or x = - 1 D) x = - 9 or x = 1

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Answers (2)

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Magdalena · Answer 1

x=1 or x=-9

Step-by-step explanation:

x^2 + 8x - 9 = 0 (8x=9x-x)

x^2 - x+9x-9=0

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

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

x-1=0 or x+9=0, then

x=1 or x=-9

Stevenson · Answer 2

Answer:D. X = - 9 or x = 1

X2 + 8x - 9 = 0