Homework Help: math help me!!

Posted by alexis on Wednesday, April 13, 2011 at 7:17pm.

is square root of 56 a rational number? explain uranswer using what you know about rational and irrational numbers.
thnx alot!

math help me!! - bobpursley, Wednesday, April 13, 2011 at 7:20pm
No, it is not rational.

sqrt(56)=sqrt(4*14)=sqrt(4*2*7)

sqrt2, sqrt 7 are irrational. The only square roots that are rational are squares of rational numbers.

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