Question

(x + 4)(x - 4) + (x + 5)(x - 5) - 2(x² - 10) , CON RESOLUCIÓN PORFAVOR

Answer 1

Respuesta:

-21

Explicación paso a paso:

$\left(x+4\right)\left(x-4\right)+\left(x+5\right)\left(x-5\right)-2\left(x^2-10\right)$

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• $\left(x+4\right)\left(x-4\right)$

$=x^2-4^2\\=x^2-16$

• $\left(x+5\right)\left(x-5\right)$

$=x^2-5^2\\=x^2-25$

• $-2\left(x^2-10\right)$

$=-2x^2-\left(-2\right)\cdot \:10\\=-2x^2+2\cdot \:10\\=-2x^2+20$

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$=x^2-16+x^2-25-2x^2+20\\=x^2+x^2-2x^2-16-25+20\\=-16-25+20\\=-21$