A part of the parabola y = a (x + 1) 2 + 2 is shown in the figure. The coordinates of the intersection of the parabola on the right side of the Y-axis and the x-axis are () A. (12,0)B. (1,0)C. (2,0)D. (3,0)
Because the axis of symmetry of the parabola y = a (x + 1) 2 + 2 is x = - 1, the intersection of the parabola and X-axis (- 3, 0), according to the symmetry, the intersection of the parabola and X-axis (1, 0), so choose B
The operation of fraction x + 1 + 1 / x x ^ 2-1 / X
(x^2-1/x) / (x+1+1/x)
=(x ^ 3-1) / (x ^ 2 + X + 1)
= x-1
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