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Algbrea 2 Math

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1 Answer

Hi again David;
x3-343=
These are two cubes...
x3-73
The equation for adding two cubes...
a3+b3=(a + b)(a2–ab+b2)
a=x
b=-7
So...
x3+(-7)3=[x+(-7)][x2-(-7)(x)+(-7)2]
x3-73=(x-7)(x3+7x+49)