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Square root 2 + square root 2/9? Please explain how to obtain the answer of 4...
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High School Teacher
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`sqrt2 + sqrt(2/9)`
Simplify the second term which can also be written as `sqrt2/sqrt9`
We know that the `sqrt9=3` or -3 but we do not need the -3 for this particular answer so will only solve using `sqrt9=3`
So we now have
Now we need to find the common denominator (LCD) which is 3 So we multiply the first term by 3 in line with the LCD and as the second term already has the 3 we just leave as is or multiply by 1.
`sqrt2/1 times 3 +sqrt2/3 times 1`
= `(3sqrt2 + sqrt2)/3`
This can also be written as `(3sqrt2 +1sqrt2)/3`
Compare it to algebra. If it was 3x + x that would be 4x because we would add the two together. Apply the same principle to `3sqrt2 +1sqrt2` Thus:
Posted by durbanville on February 26, 2013 at 9:54 AM (Answer #1)
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