If the parabola y = - 3x2-6x + 5 is known, then its vertex coordinates are______ .

If the parabola y = - 3x2-6x + 5 is known, then its vertex coordinates are______ .

The original formula = - 3 (x2 + 2x) + 5 = - 3 (x2 + 2x + 1-1) + 5 = - 3 (x2 + 2x + 1) + 3 + 5 = - 3 (x + 1) 2 + 8, then the function vertex coordinates are (- 1,8)