What is the vale of f (-4)

f (x) = 5+2|x|

f (-4) =

Answer: f (-4) = 13

Put the value of x = - 4 to the equation of the function:

f (x) = 5 + 2|x|

f (-4) = 5 + 2|-4| = 5 + 2 (4) = 5 + 8 = 13

|a| = a for a ≥ 0

examples: |3| = 3, |0.5| = 0.5, |123| = 123

|a| = - a for a < 0

examples: |-3| = - (-3) = 3, |-0.5| = - (-0.5) = 0.5, |-123| = 123