What is the absolute value of a number
2 answers:
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Minus z both sides
0=x^2+wx+z
we can use quadratic formula or manually complete the square
let's use quadratic
for
0=ax^2+bx+c
given
0=1x^2+wx-z
a=1
b=w
c=-z
or 
0=x^2+wx+z
we can use quadratic formula or manually complete the square
let's use quadratic
for
0=ax^2+bx+c
given
0=1x^2+wx-z
a=1
b=w
c=-z