Current location - Training Enrollment Network - Mathematics courses - Fourth grade math problem: known quadratic function Y = x 2-MX-4. (1) proves that the image of this function must have two different intersections with the X axis; (2) Let the function
Fourth grade math problem: known quadratic function Y = x 2-MX-4. (1) proves that the image of this function must have two different intersections with the X axis; (2) Let the function
(1), discriminant = m 2+4 * 1 * 4 > 0, so there are two intersections.
(2) Because the coordinates of the intersection point are (x 1, 0), (x2, 0) and (x2, 0), it is x 1, x2 is x2-MX-4 = 0, x 1+x2=m, x/kloc.