Given the functions:

- \( f(x) = x^2 + 5x + 6 \)
- \( h(x) \) (not yet provided)

We can start by calculating \( f(4) \):

\[
f(4) = 4^2 + 5(4) + 6
\]

Let's calculate this:

\[
f(4) = 16 + 20 + 6 = 42
\]

So, \( f(4) = 42 \).

Now, to complete the calculation of \((h \circ f)(4)\), we need the function \( h(x) \). Could you please provide the expression for \( h(x) \)?

Explore how to calculate f(4) for the quadratic function f(x) = x² + 5x + 6. Understand the step-by-step process, including the application of the quadratic formula. Suitable for high school students studying algebra.

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