Question

пример д) пожалуйста))

Answer 1

$frac{a^2+16}{a-4} + frac{8a}{4-a}= frac{a^2+16}{a-4} + frac{8a}{-(a-4)}= frac{a^2+16}{a-4} + frac{-8a}{a-4}= frac{a^2+16-8a}{a-4}=$
$=frac{a^2-2*a*4+4^2}{a-4} = frac{(a-4)^2}{a-4}= frac{(a-4)*(a-4)}{(a-4)*1} = frac{a-4}{1}=a-4$