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Which of the following equations has 1 + √2 as one of its roots?

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Re: Which of the following equations has 1 + √2 as one of its roots?  [#permalink]

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New post 03 May 2018, 16:56
I found estimation to work the best.
Sqrt2= 1.4
1+sqrt2 = 2.4
One root = 2.4 or x =2.4
X^2 = 5.76
2x= 4.8

Now you have all the values to solve. You are trying to see which expression will give you the closest value to zero.

C can be immediately crossed off because you are adding throughout the expression

When you subtract 5.76 - 4.8, you get a value close to 1 being left over.

Equation D matches what you are looking for.
Re: Which of the following equations has 1 + √2 as one of its roots? &nbs [#permalink] 03 May 2018, 16:56

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