Question 273052
<pre><font size = 4 color = "indigo"><b>
{{{4b^2 -16}}}

First factor out 4

{{{4(b^2-4)}}}

In the parentheses is the difference of two squares.
That's a special type of factoring. Have you learned how
to factor the difference of two squares? 

{{{4(b^2-2^2)}}}

{{{4(b-2)(b+2)}}}

Edwin</pre>