Completing the square: Solve: (x – 4)2 = 5?
回答 (4)
2016-09-28 5:28 pm
(x - 4)² is a complete square, so that it is not necessary for further work of completely square.
(x - 4)² = 5
x - 4 = √5 or x - 4 = -√5
x = 4 + √5 or x = 4 - √5
(x - 4)² = 5
x - 4 = √5 or x - 4 = -√5
x = 4 + √5 or x = 4 - √5
2016-09-28 5:15 pm
Is this (x-4)^2 = 5? I will assume it is and so just work it out from here:
(x-4)(x-4) = 5
x^2 - 8x + 16 = 5
x^2 - 8x + 11 = 0
Now use whatever method you like to find the roots. I suggest Quad Formula.
:)
(x-4)(x-4) = 5
x^2 - 8x + 16 = 5
x^2 - 8x + 11 = 0
Now use whatever method you like to find the roots. I suggest Quad Formula.
:)
2016-09-28 7:36 pm
[ x - 4 ]² = 5
x - 4 = ± √5
x = 4 ± √ 5
x - 4 = ± √5
x = 4 ± √ 5
2016-09-28 5:44 pm
The square is already complete.
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