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PLEASE ANSWER FAST 15 POINTS! Which number is IRRATIONAL? √49 √64 √72 √121

PLEASE ANSWER FAST 15 POINTS! Which number is IRRATIONAL? √49 √64 √72 √121
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1 vote
PLEASE ANSWER FAST 15 POINTS!

Which number is IRRATIONAL?

√49 √64 √72 √121

User Errnesto
by
8.3k points

1 Answer

4 votes
7*7=49 Therefore it's rational

8*8=64 Therefore it too is Rational

11*11=121 So... Rational

9*8=72 - it does not divide into itself as a perfect square and therefore is irrational.
User Phil Wallach
by
8.3k points
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