SOLUTION: Which expression is equivalent to 7(radical)90 a)16(radical)10 b)21(radical)10 c)70(radical)9 d)(radical)630 please tell me who you got this .

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Question 188343: Which expression is equivalent to 7(radical)90
a)16(radical)10
b)21(radical)10
c)70(radical)9
d)(radical)630
please tell me who you got this .
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
7%2Asqrt%2890%29 Start with the given expression.


7%2Asqrt%289%2A10%29 Factor 90 into 9%2A10


7%2Asqrt%289%29%2Asqrt%2810%29 Break up the square root.


7%2A3%2Asqrt%2810%29 Take the square root of 9 to get 3


21%2Asqrt%2810%29 Multiply


So 7%2Asqrt%2890%29=21%2Asqrt%2810%29