Question
Answer
$$(x+h)^4=h^4+4h^3x+6h^2x^2+4hx^3+x^4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(x+h)^4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} \htmlClass{explanationCircle explanationCircle4}{\textcircled {4}} } }}}h^4+4h^3x+6h^2x^2+4hx^3+x^4\end{aligned} $$ | |
| ① | $$ (x+h)^4 = (x+h)^2 \cdot (x+h)^2 $$ |
| ② | Find $ \left(x+h\right)^2 $ using formula. $$ (A + B)^2 = \color{blue}{A^2} + 2 \cdot A \cdot B + \color{red}{B^2} $$where $ A = \color{blue}{ x } $ and $ B = \color{red}{ h }$. $$ \begin{aligned}\left(x+h\right)^2 = \color{blue}{x^2} +2 \cdot x \cdot h + \color{red}{h^2} = x^2+2hx+h^2\end{aligned} $$ |
| ③ | Multiply each term of $ \left( \color{blue}{x^2+2hx+h^2}\right) $ by each term in $ \left( x^2+2hx+h^2\right) $. $$ \left( \color{blue}{x^2+2hx+h^2}\right) \cdot \left( x^2+2hx+h^2\right) = \\ = x^4+2hx^3+h^2x^2+2hx^3+4h^2x^2+2h^3x+h^2x^2+2h^3x+h^4 $$ |
| ④ | Combine like terms: $$ x^4+ \color{blue}{2hx^3} + \color{red}{h^2x^2} + \color{blue}{2hx^3} + \color{green}{4h^2x^2} + \color{orange}{2h^3x} + \color{green}{h^2x^2} + \color{orange}{2h^3x} +h^4 = \\ = h^4+ \color{orange}{4h^3x} + \color{green}{6h^2x^2} + \color{blue}{4hx^3} +x^4 $$ |
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