Solve the equation 10-3x-x2 = 0

Explanation

10 – 3x - x² = 0; 10 – 5x + 2x - x² = 0
5(2 – x) + x(2 – x) = 0; (2 – x)(5 + x) = 0
2 – x = 0 or 5 + x = 0; x = 2 or x = -5