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Mathematics 8 Online
OpenStudy (anonymous):

Solve (x+9)^2 -7=0 Express radicals in simplest form.

OpenStudy (blurbendy):

what is (x+9)(x+9) ?

OpenStudy (anonymous):

x^2+18x+81

OpenStudy (blurbendy):

so you have x^2 + 18x + 81 - 7 = 0 x^2 + 18x -74 = 0 can you factor this quadratic?

OpenStudy (anonymous):

keep trying to see if I can factor, but I don't think so

OpenStudy (blurbendy):

yeah, so that means we need to use the quadratic formula

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