x^2+4x^2-21x=0Решите уравнение. Created by Gelya0funny2005. algebra-ru

x^2+4x^2-21x=0Решите уравнение...

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Verified answer

$x^2+4x^2-21x=0\\\\5x^2-21x=0\\\\x\cdot (5x-21)=0\\\\x_1=0\\\\5x-21=0\; ,\; \; x=\frac{21}{5}\; ,\; \; x_2=4,2\\\\Otvet:\; \; x_1=0\; ,\; x_2=4,2\; .$

3 votes Thanks 2

sumaya13q

Ответ:

Х = { 0 ; 4,2}

Объяснение:

X^2+4x^2-21x=0

5х^2 - 21х = 0

х (5х - 21) = 0

Х1 = 0

Или

5х - 21 = 0

5х = 21

Х2 = 4,2

1 votes Thanks 0

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