expand. if necessary, combine like terms. (3 + 4x)(3 - 4x) =

Answer:

$9 - 16x^{2}$

Explanation:

Step1: Apply difference - of - squares formula

$(a + b)(a - b)=a^{2}-b^{2}$. Here $a = 3$ and $b = 4x$.

Step2: Calculate the squares

$3^{2}=9$ and $(4x)^{2}=16x^{2}$. So the result is $9-16x^{2}$.