(a + b)(a - b) = a2 - b2
for example if a = 10 and b = 2
12 x 8 = 96 = 100 - 4
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a2 - b2 = (a - b)(a + b)
a2 - b2 = (a - b)(a + b)
15y4-39y3+18y2
a2 - b2 = (a + b)(a - b).
It is the difference of two squares which is: (x+2y)(x-2y)