A/5с-a^2+25c^2/5ac+5c-a/a при а =89, с =34

Question

A/5с-a^2+25c^2/5ac+5c-a/a при а =89, с =34

Answer 1

(a-8b)(a+8b)/a² * a/(a+8b)=(a-8b)/a=(8√5-64√5)/8√5=-56√5/8√5=-7