I need help with this question: (Rationalize the denominator) Thanks
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The denominators already are rational. You can cross multiply then solve the equation. If that's what you want to do? Can you take it from there?
Originally Posted by Stroodle The denominators already are rational. You can cross multiply then solve the equation. If that's what you want to do? Can you take it from there? Oh Wait I was FOILing instead of taking the square root, thanks. So after that i get subtract 20 and divide by 5 to get Is that right?
Now you can either sub these values into the quadratic formula or complete the square to find the values of x. Do you know how to do this?
I would use the quadratic formula but it says solve using the square root principal, is that just isolating x?
Oh, sorry I misunderstood. I'm not familiar with the square root principle. But I assume it's:
Yes that is it but you have to rationalize the denominator so would the final answer be
Originally Posted by Stroodle Oh, sorry I misunderstood. I'm not familiar with the square root principle. But I assume it's: I'd make sure to rationalise the denominator... . This should be the same answer you get if you use the Quadratic Formula...
Yep. The answer would be
Oh yea plus or minus, thanks for your help I really appreciate it.
No probs. Finally got there in the end
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