Question
Answer
$$(3x-0.2)(3x+0.2)=9x^2$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(3x-0.2)(3x+0.2)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9x^2+0x+0x+0 \xlongequal{ } \\[1 em] & \xlongequal{ }9x^2 \cancel{0x} \cancel{0x}0 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}9x^2\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{3x0}\right) $ by each term in $ \left( 3x0\right) $. $$ \left( \color{blue}{3x0}\right) \cdot \left( 3x0\right) = 9x^2 \cancel{0x} \cancel{0x}0 $$ |
| ② | Combine like terms: $$ 9x^2 \, \color{blue}{ \cancel{0x}} \, \, \color{blue}{ \cancel{0x}} \,0 = 9x^2 $$ |
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