Question

(5-x) elevado ao quadrado

Answer 1

(5-x)^2
5^2-2.5.x+x^2
25-10x+x^2
x^2-10x+25=0
delta=b^2-4ac
delta=(-10)^2-4.1.25
delta=100-100
delta=0
x=-b-/+ raiz de delta/2a
x=-(-10)-0/2.1
x=10/2
x=5