You have to remember that (a-b)(a+b) = a^2-b^2
You have a denominator of x+√7
So, if you multiply top and bottom by x-√7, you have
2√7 (x-√7)
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(x+√7)(x-√7)
2√7 x - 2√7√7
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(x)^2 - (√7)^2
2√7 x - 14
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x^2-7
Rationalize the denominator of 2sqrt7/x+sqrt7
I need steps to do this. Been a while since high school. Thanks
1 answer