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What is the sum of all possible values of x such that 2x(x - 10) - x(x - 5) = -50?

 Feb 9, 2021
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What is the sum of all possible values of x such that 2x(x - 10) - x(x - 5) = -50?

 

2x^2 - 20x -x^2 + 5x = -50    simplify

x^2 -15x + 50 = 0     factor (or use Quadratic Formula)

(x-10)(x-5) = 0

     x = 10   or  5             add 'em......

 Feb 9, 2021

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