SOLUTION: I need help with the steps on how to do this problem, my mathematical intuition is lacking. Reduce to one term with a positive rational denominator 4-(sqrt5x/2)

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Question 896054: I need help with the steps on how to do this problem, my mathematical intuition is lacking.
Reduce to one term with a positive rational denominator
4-(sqrt5x/2)
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Although I did a couple or maybe three of these within last few minutes, the ambiguity in your expression may be a problem. WHAT is the actual expression you have?

4-sqrt%285x%29%2F2?

4-sqrt%285x%2F2%29 ?

My guess, it's the second one.
My other solutions for your questions should be more than enough to understand what to do here.