Question

Se  m+h=4  e m²-h²=80 ,determine o valor de m-h.
a)1
b)2
c)3
d)4
e)5

Answer 1

$m^2-h^2=(m+h)(m-h)=80\\ \\ m-h=\frac{80}{m+h}\\ \\ Mas, \ m+h=4 \\ \\ \boxed{m-h=\frac{80}{4}=20}$