The value of the function operation f(a + h) - f(a) is; h² + 5h + 2ah
We are given the function;
f(x) = x² + 5x
We want to find f(a + h) - f(a)
Let us first find f(a + h) to get;
f(a + h) = (a + h)² + 5(a + h)
⇒ a² + 2ah + h² + 5a + 5h
⇒ a² + 5a + h² + 5h + 2ah
Let us now find f(a) to get;
f(a) = a² + 5a
Thus, f(a + h) - f(a) = a² + 5a + h² + 5h + 2ah - a² - 5a
f(a + h) - f(a) = h² + 5h + 2ah
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