Câu hỏi của Kafu Chino

Question

125-x6

49(x-4)2-9(y+2)2

GIÚP MIK VỚI CẦN GẤP Ạ !!!

Phạm Tú Uyên · Accepted Answer

$125-x^6=\left(5\right)^3-\left(x^2\right)^3$

$=\left(5-x^2\right)\left(25+5x^2+x^4\right)$

$49\left(x-4\right)^2-9\left(y+2\right)^2$

$=\left[7\left(x-4\right)\right]^2-\left[3\left(y+2\right)\right]^2$

$=\left[7x-28\right]^2-\left[3y+6\right]^2$

$=\left(7x-28-3y-6\right)\left(7x-28+3y+6\right)$

$=\left(7x-3y-34\right)\left(7x-22+3y\right)$Câu trả lời: $125-x^6=\left(5\right)^3-\left(x^2\right)^3$

$=\left(5-x^2\right)\left(25+5x^2+x^4\right)$

$49\left(x-4\right)^2-9\left(y+2\right)^2$

$=\left[7\left(x-4\right)\right]^2-\left[3\left(y+2\right)\right]^2$

$=\left[7x-28\right]^2-\left[3y+6\right]^2$

$=\left(7x-28-3y-6\right)\left(7x-28+3y+6\right)$

$=\left(7x-3y-34\right)\left(7x-22+3y\right)$