0
Anonymous
For a polynomial a2 - b2 = (a + b)(a - b).
So for x2 - 16y2 ---> a = x, and b = 4y: (x + 4y)(x - 4y)
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x2 + 6x = x*(x + 6)
38
x(x+5)
4(x2 + 4)
( x - 14 ) ( x + 14 )