In the third week of Precalc, we have learned about absolute value of a real number and how any real number can be represented on a number line. We have also learned about Roots and Radicals and how to simplify them.

Example: (if the radicand is negative in the l l it should become positive once you square rooted it)

l7+2l (3-8) + (-6) (4-1)

l9l (-5) + (-18)

9(-5) + (-18)

-45 + (-18)

= -63

Example: Simplify

(how we got 4 in 5×4 outside of the square root is that 4×4 inside the squared root is 16 and if we square root 16 it will be 4 and then we move the number 4 outside and times it with 5)

=