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The distance between the points (x, 21) and (7,4) is 20√2. Find the sum of all possible values of x.

 Sep 21, 2021
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Use distance formula

d^2 = 800    

800 = ( x-7)^2 + ( 21-4)^2

800 = x^2 -14x+49 + 289    

x^2  - 14x -462 = 0       <=======  Now use Quadratic Formula to solve for 'x'

 Sep 21, 2021

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