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The square root of twice a certain number is subtracted from the number and the result is 4.Find the number?
Updated: 4/28/2022
Wiki User
∙ 14y agoBest Answer
Suppose the number is x
Then x - sqrt(2x) = 4
x - 4 = sqrt(2x)
Squaring both sides: x2 - 8x + 16 = 2x
So that x2 - 10x + 16 = 0
Factorising: (x - 2)(x - 8) = 0
So x = 2 or x = 8.
Remember that sqrt(4) can also be -2.
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∙ 14y agoThis answer is:
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