Question

Evaluate 5|7 - 9| - 2.

Answer 1

Is that 5/7?

Answer 2

5|7-9| - 2 = 5|-2| - 2 = 5(2) - 2 = 10-2 = 8. Reference the efinition of modulus:
\[|x| = x\] if x>0,
and
\[|x| = -x\] if x<0
and obviously \[|0| = 0\]
this is the definition of the norm on \[\mathbb{R}.\]