1. The problem is to combine the constant terms by finding a common denominator and express the polynomial in standard form. 2. Given the fractions $\frac{4}{3}$ and $\frac{12}{3}$, we want to subtract $\frac{4}{3}$ from $\frac{12}{3}$. 3. Both fractions have the same denominator 3, so subtract the numerators: $$\frac{12}{3} - \frac{4}{3} = \frac{12 - 4}{3} = \frac{8}{3}$$ 4. Therefore, the expression in standard form is: $$x^2 + 4x + \frac{8}{3}$$ This completes the combination of constant terms and rewriting the expression in standard form.