Question

Determine a raiz,aplicando a fórmula de Bhaskara:
(X-1) (x+3)=5

Answer 1

(x-1)(x+3)=5
x^2+3x-x-3-5=0
x^2+2x-8=0

a=1
b=2
c=-8

x=-b+-*raiz* b^2-4.a.c/2.a
x=-2+-*raiz*2^2-4.1.(-8)/2.1
x=-2+-*raiz*4+32/2
x=-2+-*raiz*36/2
x=-2+-6/2

x'=-2+6/2
x'=4/2
x'=2

x"=-2-6/2
x"=-8/2
x"=-4