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OpenStudy (anonymous):
What are the solutions of the equation x² – 9 = 0?
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OpenStudy (experimentx):
+3 and -3
OpenStudy (experimentx):
factorize using a^2-b^2 formula
OpenStudy (anonymous):
you can rewrite the equation in this way (x-3)(x+3)=0, so you have x=3 e x=-3
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