(x + 5y)(x + 7y)
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3x2 - 2y2 = 9x2 + 4y2 - 12xy (subtract 3x2 and add 2y2 to both sides) 0 = 9x2 -3x2 + 4y2 + 2y2 - 12xy 0 = 6x2 + 6y2 - 12xy (divide by 6 to both sides) 0 = x2 + y2 - 12xy or x2 - 2xy + y2 = 0 (x - y)(x - y) = 0 x - y = 0 x = y
x + 4
x2 + 5x - 120 can not be factored.
x2 + 8x + 15 = (x + 3) (x + 5).
(x2 plus 40) (x minus 1)