Question

помогите решить уравнение (х-5)(х+1)=0

Answer 1

х^2 -5x +x -5 =0
x^2 -4x -5 = 0
D = 16 -4(-5) = Y 36;  D= 6
x1= (4 +6)/2 = 5
x2 = (4-6)/2 = -1
x1=5
x2=- 1