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OpenStudy (anonymous):
why is x^2+81 prime???
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OpenStudy (anonymous):
Come someone help me please I have a math test next period!!
hero (hero):
x^2 + 81 is prime because it cannot be factored any further. x^2 + 81x can be factored to x(x + 81) x^2 - 81 can be factored to (x + 9)(x - 9) But x^2 + 81 cannot be factored in any such way because it has no common factors.
OpenStudy (anonymous):
Ooo thanks so much
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