Question 1016706
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When the sum of 511 and four times a positive number is subtracted from the square of the number, the result is 110. Find the number 
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Your equation is

{{{x^2 - (511 + 4x)}}} = {{{110}}}.

Solve it:

{{{x^2 - 4x - 621}}} = {{{0}}}.

Factor it:

{{{x^2 - 4x - 621}}} = (x-27)*(x+23).

The roots are x = 27 and x = -23. 
Only positive x = 27 suits.
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