Question

multiply.
(u - 3)(u + 3)
simplify your answer.

Explanation:

Step1: Apply the difference of squares formula

The formula for the product of a sum and a difference is \((a - b)(a + b)=a^2 - b^2\). Here, \(a = u\) and \(b = 3\).
So, \((u - 3)(u + 3)=u^2-3^2\)

Step2: Simplify \(3^2\)

We know that \(3^2 = 9\), so substituting that in we get \(u^2 - 9\).

Answer:

\(u^2 - 9\)