### Algebra: Calculating with exponents and roots

### Square roots

Square roots

Recall that #\sqrt{\blue {9}} = \orange 3#. \[\orange x^2=\blue a \qquad \text{and} \qquad \orange x\geq 0\] |
\[\begin{array}{c} |

no

We can substitute every value for #x# for which #x-2# is greater than or equal to #0# since the number below the root sign cannot be negative.

If we substitute #x=-9#, we get #-9-2=-11 \lt 0 #. Hence, we can not substitute this value.

We can substitute every value for #x# for which #x-2# is greater than or equal to #0# since the number below the root sign cannot be negative.

If we substitute #x=-9#, we get #-9-2=-11 \lt 0 #. Hence, we can not substitute this value.

Unlock full access

Teacher access

Request a demo account. We will help you get started with our digital learning environment.

Student access

Is your university not a partner?
Get access to our courses via

Or visit omptest.org if jou are taking an OMPT exam.

**Pass Your Math**independent of your university. See pricing and more.Or visit omptest.org if jou are taking an OMPT exam.