问题已知二次函数y=x~2+bx-3的图象经过点P(-2,5).(1)要使y随x的增大而增大,求x的取值范围;(2)设点P_1(m,y_1),P_2(m+1,y_2),P_3(m+2,y_3),P_4(-3,y_4)在这个二次函数的图象上,m≥5.①比较y_1与y_4的大小,说明理由;②y_1,y_2,y_3能否作为同一个三角形的三边的长?为什么?这是2013年的中考题,也是2014年中考模拟试卷中的题目,通过阅卷,发现学生答题中存在一些共 Problem It is known that the image of the quadratic function y = x ~ 2 + bx-3 passes through the point P (-2,5). (1) To make y increase with the increase of x, find the range of x; (2) Set points P_1 (m, y_1), P_2 (m + 1, y_2), P_3 (m + 2, y_3), P_4 (-3, y_4) on this quadratic function image, . ① compare the size of y_1 and y_4, explain the reasons; ② y_1, y_2, y_3 can be used as the same triangle on both sides of the long? Why? This is the 2013 senior high school entrance examination questions, Scroll, found that there are some students in the total answer