Which shows one way to determine the factors 4x^3+x^2-8x-2 by grouping
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This is Pythagorean's Theorem, with one leg being 10 and the hypotenuse being 16. Using those values in the theorem looks like this:
and
and
so
Take the square root of both sides to find that b = 12.5
and
and
so
Take the square root of both sides to find that b = 12.5