Помогите решить примеры по алгебре 8 класс. Created by sashokvkn1. algebra-ru

A) 3x² - 7x + 2 = 0D = (-7)² - 4 * 3 * 2 = 49 - 24 = 25 = 5²б) x² + ax - 2a² = 0D = a² - 4 * 1 * (- 2a²) = a² + 8a² = 9a² = (3a)²в)3x² + 2x - 5 = 0

Помогите решить примеры по алгебре 8 класс...

sashokvkn1 @sashokvkn1

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Помогите решить примеры по алгебре 8 класс

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A) 3x² - 7x + 2 = 0
D = (-7)² - 4 * 3 * 2 = 49 - 24 = 25 = 5²
$x _{1}= \frac{7+5}{6}=2\\\\x _{2}= \frac{7-5}{6} = \frac{1}{3}$

б) x² + ax - 2a² = 0
D = a² - 4 * 1 * (- 2a²) = a² + 8a² = 9a² = (3a)²
$x _{1} = \frac{-a+3a}{2}= \frac{2a}{2}=a\\\\x _{2}= \frac{-a-3a}{2}= \frac{-4a}{2}=-2a$

в)3x² + 2x - 5 = 0
$\frac{D}{4} =( \frac{2}{2}) ^{2}-3*(-5)=1+15=16=4 ^{2} \\\\x _{1}= \frac{-1+4}{3} =1\\\\x _{2} = \frac{-1-4}{3} =- \frac{5}{3}=-1 \frac{2}{3}$

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