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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

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2 answers

  1. √21√7 + √3
    = √3√7√7 + √3
    = 7√3+√3
    = 8√3

    the answer matching this is b)
    but they should have simplified this.

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  2. thanks reiny

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