Question

equação do 2° grau
1) x²+ 2x -8 =7

Answer 1

x^2+2x-8=7
x^2+2x-8-7
x^2+2x-15=0
delta=b^2-4ac
delta=2^2-4.1.(-15)
delta=4+60
delta=64
x=-b-/+ raiz de delta/2a
x=-2-8/2.1
x=-10/2
x=-5
x=-2+8/2.1
x=6/2
x=3