Question

factor.
$4 - y^2$

Explanation:

Step1: Identify the difference of squares

The expression \(4 - y^2\) can be written as \(2^2 - y^2\), which is a difference of squares. The formula for factoring a difference of squares is \(a^2 - b^2=(a + b)(a - b)\).

Step2: Apply the difference of squares formula

Here, \(a = 2\) and \(b = y\). Substituting these into the formula, we get \((2 + y)(2 - y)\).

Answer:

\((2 + y)(2 - y)\)