Помогите пожалуйста -x^2+8x+9=0. Created by yanaaleynik. algebra-ru

Помогите пожалуйста -x^2+8x+9=0...

AnonimusPro

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$-x^2+8x+9=0
\\x^2-8x-9=0
\\D=64+36=100=10^2
\\x_1= \frac{8+10}{2} =9
\\x_2= \frac{8-10}{2} =-1$
Ответ: x1=9; x2=-1

1 votes Thanks 0

Universalka

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- x² + 8x + 9 = 0
x² - 8x - 9 = 0
D = (-8)² - 4 * 1 * (- 9) = 64 + 36 = 100 = 10²
$X _{1}= \frac{8+ \sqrt{100} }{2}= \frac{8+10}{2}=9\\\\X _{2}= \frac{8- \sqrt{100} }{2}= \frac{8-10}{2}=-1$

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