Question

Me ajudem com esta questão por favor
(5/4a+4/5b)^2

Answer 1

(5/4 a + 4/5b)²=

(5/4 a + 4/5b) .(5/4 a + 4/5b)=

5/4a.5/4a + 5/4a.4/5b+4/5b.5/4a +4/5b.4/5b=

25/16 a²+20/20 ab+ 20/20 ab + 16/25b²=

25/16a² + ab +ab + 16/25b²=

25/16a²+2ab +16/25b².