Question

(×+8).(×-5) cálculo me ajudem

Answer 1

(x + 8) * (x - 5)
x² - 5x + 8x - 40
x² + 3x - 40

Equação: x² + 3x - 40 = 0

Answer 2

(x+8).(x-5)
x²-5x+8x-40=
x²+3x-40
a=1 b=3 c=-40
∆=b²-4ac
∆=3²-4.1.(-40)
∆=9+160
∆=169
x=-b±√∆/2a
x¹=3+√169/2.1= 3+13/2=8
x²= 3-√169/2.1= 3-13/2=-5