andrejr0330jr
10.03.2020 •
Mathematics
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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Ответ:
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
Ответ: