Factor Special Forms of Quadratics

How to #factor special forms of #quadratics: perfect square and difference of squares.
If you have a quadratic where the first and last terms are perfect squares (1, 4, 9, 16, 25, 36, 49, 64, 81, ...) then there's a 99% chance that it is a perfect square.
Example: 9x² + 42x + 49 = (3x + 7)². To make sure that it is correct double 3 * 7 = 42.

If you have a quadratic where there is a square minus a square. Then it is difference of squares.
Example: 9x² - 49 = (3x + 7)(3x - 7).

This video could work for #Algebra students who were absent, or in a flipped classroom.

0:00 Intro
0:14 Review Expand
3:07 Strategy Overview
4:37 ID Factoring Strategy
7:09 Factor 4x² + 12x + 9
8:59 Factor 25x² - 40x + 16
10:11 Factor 4x² - 9
11:39 Factor 25x² - 16
12:27 Review GCF and Guess & Check
15:18 Wrap-Up