Let x and y will be your two numbers.
x + y = 4
xy = 10
x + y = 4
y = 4-x
xy = 10
x(4-x) = 10
4x - x² = 10
- x² + 4x - 10 = 0
(a + √a² - 4b)/2
(4 + √4² - 4(-10))/2
(4 + √16 + 40)/2
(4 + √56)/2
(4 + 2√14)/2
2(2 + √14)/2
2 + √14
(4 - 2√14)/2
2(2 - √14)/2
2 - √14
