tianar63927 tianar63927

10-03-2020
Mathematics

contestada

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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shelbyrayann2 shelbyrayann2

10-03-2020

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

X2 + 8x - 9 = 0

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miljanamilovanovic12 miljanamilovanovic12

18-03-2020

Answer:

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

Answer Link

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