Question

FATORE
$x^{4} - y ^{4}$
$(a + b). \times + 2(a + b)$
$(x + y) ^{2} - (x - y )^{2}$
$25x ^{2} + 70x + 49$
me ajudem nessa ​

Answer 1

$a)\\x^4-y^4=(x^2)^2-(y^2)^2=\boxed{(x^2-y^2)(x^2+y^2)}\\b)\\(a+b)x+2(a+b)=\boxed{(a+b)(2+x)}\\c)\\(x+y)^2-(x-y)^2=(x^2+y^2+2xy)-(x^2+y^2-2xy)=x^2+y^2+2xy-x^2-y^2+2xy=\boxed{4xy}\\d)\\25x^2+70x+49=\boxed{(5x+7)^2}$