How to judge whether a + B + C.A + B-C 2a-c 2a-b is greater than zero if a graph of quadratic function is given
When x = 1, y = a + B + C to see the value of Y
Y = a + B-C when x = 1
C is the intersection of the image and the Y axis. C is above the X axis, C > 0; C is below the X axis, C0; the opening of the image is down, a
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