Answer:
see explanation
Step-by-step explanation:
To begin with find g(f(x)) by substituting x = f(x) into g(x)
g(2x + 5) = (2x + 5)² = 4x² + 20x + 25
Now substitute x = g(f(x)) into h(x)
h(4x² + 20x + 25) = - 2(4x² + 20x + 25) = - 8x² - 40x - 50, hence
h(g(f(x))) = - 8x² - 40x - 50
