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OpenStudy (anonymous):
x^2 +21-25 how does this get to (x-2)(x+2)
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OpenStudy (anonymous):
It doesn't, I think there might be a mistake but I can tell you that this looks like a factoring problem where you would FOIL the second expression. FOIL= multiply the first, inner, outer, last; x times x, x tims 2, -2 times x, -2 times 2
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