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The area of a rectangle is represented by 5x^2+19x+12. What is the length?

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[tex]5x^2+19x+12=5x^2+15x+4x+12=5x(x+3)+4(x+3)\\\\=(x+3)(5x+4)\\\\Answer:x+3\ \times\ 5x+4[/tex]

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