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OpenStudy (frostypaz1):
please show your work for this: x^2-8x+16=81
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OpenStudy (confluxepic):
Welcome to OpenStudy! @Frostypaz1 Wrong section. :)
Directrix (directrix):
x^2-8x+16 is a perfect square trinomial and follows the factoring pattern: (x - 4)*( x-4) or (x - 4) ^2 81 is a perfect square The equation has become: (x - 4) ^2 = 81 Take square roots of both sides. x - 4 = 9 OR x - 4 = -9 x = 13 OR x = - 5 @Frostypaz1
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