Whenever you have a Sum & a Product of two, the easiest way to calculate them is to use o numbers the following quadratic equation: X² - SX + P = 0 , where S = sum and P = product X² - 64X + 988 = 0 , solving for X will give you the result: X₁ = [-b + √(b² - 4.a.c)]/2a    And  X₂ = [-b - √(b² - 4.a.c)]/2a  X₁ = [+64 + √(64² -( 4).(1)(988)]/2   and X₂ = [+64 - √(64² -( 4).(1)(988)]/2 X₁ = 38   and X₂ = 26