Question

How do you factor by grouping: xy - 2y + 2x - 4.

Answer 1

apply parenthesises and factor out the commons

Answer 2

xy - 2y + 2x - 4

(xy - 2y) + (2x - 4)

y(x - 2) + 2(x - 2)

Answer 3

then factor out commons anew


y(x - 2) + 2(x - 2)

(y+2)(x - 2)