Answer
$$(6x+4)(6x-4)=36x^2-16$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(6x+4)(6x-4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}36x^2-24x+24x-16 \xlongequal{ } \\[1 em] & \xlongequal{ }36x^2 -\cancel{24x}+ \cancel{24x}-16 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}36x^2-16\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{6x+4}\right) $ by each term in $ \left( 6x-4\right) $. $$ \left( \color{blue}{6x+4}\right) \cdot \left( 6x-4\right) = 36x^2 -\cancel{24x}+ \cancel{24x}-16 $$ |
| ② | Combine like terms: $$ 36x^2 \, \color{blue}{ -\cancel{24x}} \,+ \, \color{blue}{ \cancel{24x}} \,-16 = 36x^2-16 $$ |
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