Question 176685
Although you don't specifically say, I assume that you want to determine the number.


The number: {{{x}}}


The square of the number:  {{{x^2}}}


15 more than the square of the number:  {{{x^2 + 15}}}


8 times the number: {{{8x}}}


15 more than the square of the number is (=) 8 times the number:  {{{x^2 + 15 = 8x}}}


Put the quadratic into standard form and solve by factoring:


{{{x^2 -8x + 15 = 0}}}


Hint: -3 + (-5) = -8 and -3 X -5 = 15