We are given:
f(x) = -x² - 1
g(x) = x + 5
Finding f(g(x)):
because g(x) = x+5
f(g(x)) = f(x+5)
f(x+5) = -(x+5)² - 1
f(x+5) = -(x² + 25 + 10x) - 1
f(x+5) = -x² - 25 - 10x - 1
f(x+5) = -x² - 10x - 26
comparing with the question,
first blank = (-1)
second blank = (-10)
third blank = (-26)
