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Anonymous
-79
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This is a difference of two squares.
Solution: (x-9)*(x+9)
Wiki User
(x - 9)(x + 9)
(81 - m2) = (9 - m)(9 + m)
4x2-81
eigthy one plus a number
x + 81
(B - A)2 - 81 or (B - A + 9)(B - A - 9) If the starting point, A, is taken as zero the the expression simplifies to (B + 9)(B - 9)