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x^2-8x+16=8

complete the square using the square root property

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Ralph L. | Algebra I, II, Visual Basic, Beginning C++ tutorAlgebra I, II, Visual Basic, Beginning C...
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x2 - 8x + 16 = 8

√(x2 - 8x + 16) = √8

the above is same as:

x - 4 = √8

x = 4 ±√8