math

if 13 times a number x is added to twice its square.the result is 84.find x

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1. 2 x^2 + 13 x - 84 = 0

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2. If 13 times a number is added to twice it square the result is 84 obtain a quadratic equation, find x

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3. I really don't know am also asking

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4. Thanks

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I also don't know it

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6. 2 x 2 +13 x - 84 use quadratic equation

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