Question

simplifique a expressao (x+4).(x-1)=5x+20

Answer 1

I) x×(x-1) = 5x +20
II) 4×(x-1) = 5x +20

I +II = 5x +20

x^2 -1x +4x -4 = 5x +20

x^2 +3x -4 = 5x +20

x^2 +3x -5x -4 +20 = 0

x^2 -2x +16 = 0