Homework Help: algebra

Posted by anthony on Thursday, June 24, 2010 at 4:07pm.

Simplify: sqrt (21) (sqrt(7) + sqrt(3))

a) 7 sqrt (3) + 3 sqrt(7)
b) 7 sqrt(3) + sqrt (3)
c) sqrt (210)
d) sqrt (147) + sqrt (63)''.

a

algebra - Reiny, Thursday, June 24, 2010 at 4:14pm
√21√7 + √3
= √3√7√7 + √3
= 7√3+√3
= 8√3

the answer matching this is b)
but they should have simplified this.
algebra - anthony, Thursday, June 24, 2010 at 4:16pm
thanks reiny

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