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OpenStudy (jazzyfa30):
Solve the equation by factoring: x2 - 81 = 0
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hartnn (hartnn):
81 is the square of which number?
OpenStudy (jazzyfa30):
9
hartnn (hartnn):
right! so, we have \(x^2-9^2 =0\) now use \(a^2-b^2=(a+b)(a-b)\) to factor that!, what u get ?
hartnn (hartnn):
a=x, b=9
OpenStudy (jazzyfa30):
-9 or 9
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OpenStudy (pradius):
(x+9)(x-9)
hartnn (hartnn):
correct! good :)
OpenStudy (jazzyfa30):
ok
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