SOLUTION: 3sqrt7/-1-sqrt27

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Question 33044: 3sqrt7/-1-sqrt27
Answer by sarah_adam(201) About Me  (Show Source):
You can put this solution on YOUR website!
3sqrt%287%29/-%281%2Bsqrt%2827%29%29
now rationalise the numerator by multipling wit sqrt 7 on both numerator and denominator
3sqrt%287%29* sqrt%287%29/-%28sqrt%287%29%2Bsqrt%2827%29%2Asqrt%287%29%29
- 3*7/%28sqrt%287%29%2Bsqrt%2827%2A7%29%29
-21/sqrt%287%29%2Bsqrt%28169%29
-21/sqrt%287%29%2B+13
now rationalise the denominator by multipling with 13+-+sqrt%287%29 to both numertor and denominator
-21 * (13+-+sqrt%287%29)/%2813%29%5E2+-+%28sqrt%287%29%29%5E2
-21 * (13+-+sqrt%287%29)/169 - 7
-21 * (13+-+sqrt%287%29)/162
-7* (13+-+sqrt%287%29)/54