9x²+3x-2=0 решите уравнение. Created by IIslam77. algebra-ru

9x²+3x-2=0 решите уравнение...

mozzg3000

$9x^{2}+3x-2=0\\\\D=3^{2}-4*9*(-2)=9+72=81=9^{2}\\\\x_{1}=\frac{-3-9}{18}=-\frac{12}{18}=-\frac{2}{3} \\\\x_{2}=\frac{-3+9}{18}=\frac{6}{18}=\frac{1}{3}\\\\Otvet:\boxed{-\frac{2}{3}; \ \frac{1}{3}}$

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Ответ:

Объяснение:

Находим дискриминант D=9+4*9*2=81

x1=(-3+9)\18=1\3

x2=(-3-9)\18=-2\3

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