Question

calcula m + ( n + 8 ) :. m+n=12

Answer 1

m+n=5 y mn= 2 elevamos al cuadrado (m+n)²=5²

m²+2mn+n²=25

m²+2(2)+n²=25

m²+n²=21

hallas (m-n)²=m²-2mn+n²

=21-2(2)=17