Question

The sum of two numbers is 8, and their product is 80.

Answer 1

From their sum, the numbers are ' x ' and ' 8 - x ' .

From their product,  x(8 - x) = 80 .

When you massage and manipulate this equation into the standard
quadratic form, you have

         x² - 8x + 80 = 0  .

Applying the quadratic formula to tease out the solutions of this equation,
we find that they are

           x = 4 + 64 i
and
           x = 4 - 64 i