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8x 30x 10x 70x 30x 10x 20x

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8x²-30x-10x²+70x=-30x+10x²-20x²

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Answer to a math question 8x²-30x-10x²+70x=-30x+10x²-20x²

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128 Answers

$-2x^{2}+40x=-30x-10x^{2}$

$8x^{2}+40x=-30x$

$8x^{2}+70x=0$

$x_{1,2}=\frac{-70\pm \sqrt{70^{2}-4\cdot 8\cdot 0}}{2\cdot 8}$

$x_{1,2}=\frac{-70\pm 70}{2\cdot 8}$

$x_{1}=\frac{-70+70}{2\cdot 8},x_{2}=\frac{-70-70}{2\cdot 8}$

$=0$

$=-\frac{35}{4}$

$x=0,x=-\frac{35}{4}$

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