(x + 12) (x + 5)
Объяснение:
ax² + bx + c = a (x - x1) (x - x2)
x² + 17x + 60
x1 * x2 = 60
x1 + x2 = -17
x1 = -12
x2 = -5
x² + 17x + 60 = (x + 12) (x + 5)
