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The difference of the square of a number and 28 is equal to 3 times that number find the positive solution

 Jan 31, 2020
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x2 - 28  =  3x

x2 - 3x - 28  =  0

(x - 7)(x + 4)  =  0

 

Either  x = 7  or  x = -4.

 

The positive solution:  7

 Jan 31, 2020

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