Find the range: y = x square - 2x - 2 / 5 (- 2)

Find the range: y = x square - 2x - 2 / 5 (- 2)

y= x²-2x-(2/5)
= (x-1)²-(7/5)
When x = 1, y has a minimum value - (7 / 5)
When x = 3, y is 13 / 5
When x = - 2, y = 38 / 5
So the value range [- 7 / 5,38 / 5)