Surds
Evaluate expressions involving numerical roots
Interactive practice questions
Which of the following is true for a principal square root?
None of these statements are true.
A
There are two principal square roots of any positive number.
B
The values of principal square roots are always positive.
C
It is only possible to find the principal square root of a positive number.
D
Easy
< 1min
Write the principal square root of $16$16.
Do not evaluate it.
Easy
< 1min
Write the negative square root of $49$49.
Do not evaluate it.
Easy
< 1min
Peter said that $\sqrt{441}$√441 is equal to $21$21 because $441$441 is actually $21^2$212, which is $21\times21$21×21, so the square root of this is just $21$21. True or false?
Easy
< 1min
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