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Please answer my first question

Please answer my first question-example-1
User Juniperi
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1 Answer

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\textit{area of a rectangle}\\\\ A=bh ~~ \begin{cases} b=base\\ h=height\\[-0.5em] \hrulefill\\ b=2x^2+5x+4\\ h=5x^3 \end{cases}\qquad \begin{array}{llll} \\\\\\ A~~ = ~~ \end{array} \begin{array}{cllll} 2x^2+5x+4\\\\ * ~~ 5x^3\\\cline{1-1} 10x^5+25x^4+20x^3 \end{array}

User Drew Wills
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