The square of the sum of a number and six is eighty-one. find the number

Hi there! The numbers can be either -15 or 3.

Let the number be represented by X.


First we work out the parentheses.


Now subtract 81 from both sides.


Using the sum of 12 and a product of 45 we get.


AB = 0 gives A = 0 or B = 0



Therefore, the numbers are either -15 or 3.

Is there a picture and I think a translation will