Hello!
To solve for (f + g)(-6), we substitute the value -6 into each function and add the answers together.
f(-6) = (-6)² - 5
f(-6) = 36 - 5 = 31
and
g(-6) = 15 - (-6)
g(-6) = 21
(f + g)(-6) = 31 + 21 = 52
Therefore, the final value of the function (f + g)(-6) is equal to 52.