Question 1040842
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{{{6x + x^2}}} = {{{91}}}.

{{{x^2 + 6x - 91}}} = {{{0}}}.

Factor left side:

(x-7)*(x+13) = 0.

===>  x = 7 or  x = -13.

Since the number is positive, only one solution remains: x = 7.

Check: 6*7 + 49 = 42 + 49 = 91.

<U>Answer</U>.  The number is 7.
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Solved.