Question

What is the factored form of x2 + 3xy - 28y2?

Answer 1

x^2 + 3xy - 28y^2
What are the factors of 28 that subtract to give you 3?
1 * 28, 2*14, 4*7, 7*4, 14*2, 28*1
1-28 = -27
2-14 = -12
4 - 7 = -3
7 - 4 = 3
14 - 2 = 12
28 -1 = 27
(x + 7y)(x - 4y)