SOLUTION: subtract simply by collecting like radical terms it possible. 9 sqrt 18 - 6 sqrt 2

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Question 165005: subtract simply by collecting like radical terms it possible.
9 sqrt 18 - 6 sqrt 2
Answer by nerdybill(5404) About Me  (Show Source):
You can put this solution on YOUR website!
9%2Asqrt%2818%29+-+6%2Asqrt%282%29
Factor numbers inside radical to it's prime numbers:
9%2Asqrt%282%2A3%2A3%29+-+6%2Asqrt%282%29
Pull out "pairs" of like numbers:
9%2A3%2Asqrt%282%29+-+6%2Asqrt%282%29
27%2Asqrt%282%29+-+6%2Asqrt%282%29
Factor out sqrt(2):
sqrt%282%29%2827+-+6%29
sqrt%282%29%2821%29
21%2Asqrt%282%29