Question

Me ajudaaa. responda a questão a b e c porfavor

Answer 1

Bom dia, vamos começar:

a)-

$\frac{(a-b)^2-b^2}{a*(a-4)-4*(b^2-a)} \\ \\ \frac{a^2-2ab+b^2-b^2}{a^2-4a-4b^2+4a} \\ \\\frac{a^2 - 2ab}{a^2-4b^2} \\ \\ \frac{a*(a-2b)}{(a+2b)*(a-2b)} \\ \\ \boxed{\frac{a}{a+2b}}$

b)-

$\frac{2ax + 2ay + bx +by}{3cx+3cy+dx+dy} \\ \\\frac{(2a+b)(x+y)}{(3c+d)(x+y)} \\\\\boxed{\frac{2a+b}{3c+d}}$

c)-

$\frac{a^2-14a+49}{3a-21}\\ \\\frac{a^2 - 2a*7+7^2}{3(a-7)} \\\\ \frac{(a-7)^2}{3(a-7)}\\ \\\boxed{\frac{a-7}{3}}$