Recall distributivity a(b + c) = ab + ac = (b + c)a
and associativity (ab)c = a(bc) (a + b) + c = a + (b + c)
as well as commutativity ab = ba a + b = b + a
we are gonna need those. See for yourself when I applied each to learn the trick:
ax - bx - ay + yb = (ax - bx) + (-ay + yb) = x(a - b) + -y(a - b) = (x - y)(a - b)
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No
The greatest common factor (GCF) is 4.
The GCF is 8. 8(m + n)
(2a + b)(2c + d)
Doesn't factor evenly, use quadratic