Question

factorise by expression (x+3)-5(x+3)

Answer 1

(x + 3) - 5(x+3)

multiply with 5

(x+3) -5x -15

then we get
-5x+x+3-15= 0
-4x -12 = 0
-4x = +12
4x = -12
x = - 12 / 4
x = -3