The coordinate of point B is (3,0). (2 points)

(2)δ△AOC∽△COB is obtained by ∠ ACB = ∠ACB =∠AOC =∠COB = 90°,

∴AOCO=COBO，

∴CO=3，

∴b=3

When x=- 1, y=0, -a-2a+3=0,

∴a=33(4 points)

∴y=-33x2+233x+3；

(3) The coordinates of point M are: (2) This answer has been recommended, praised and trampled by the questioner. What is your evaluation of this answer? Put away comments//high quality or satisfaction or special types or recommended answers dottimewindow.iperformance & window.iperformance.mark ('c _ best',+newdate); Lawyer recommendation service: If your problem has not been solved, please describe your problem in detail and consult other similar problems free of charge through Baidu Law Pro 2022- 10-26. As shown in the figure, it is known that the parabola y=ax2+bx+2 intersects the X axis at two points A (-4,0). B( 1, 0), and intersects the y axis. 0) The intersection point with the X axis is B(- 1, 0), and it intersects with the negative half axis of the Y axis at point C1452013-12-22. The parabola y 1=ax2+bx+c(a≠0) is known that 588201-12-25 intersects with the y axis: as shown in the figure, the parabola y =-x 2+bx+c intersects with the x axis and respectively. Its vertex is D520 13-06-07. It is known that the two intersections of the parabola Y = AX2+BX+C (A > 0) and the X axis are A(- 1 0) and B (3,0) respectively, and the intersection with the Y axis is point D, and the vertex is C332065438+. It is known that the parabola y=ax2-2ax+c(a≠0) intersects the Y axis at point C (0,3) and the X axis at point A (0,3). & gt recommended for you: F.context('cmsRight', [{'URL':'/d01373f082025aaf511aa256e9edab64034f1a07? x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId':'A24KA00562 '，}，{ ' URL ':/s？ word = % E6 % AC % A7 % E6 % B4 % B2 % E6 % 9D % AF & sa = searchpromo _ ozb _ zhidao _ tuijian '，' src ':'/3 BF 33 a 87 e 950352 AAF 5 df 4954 143 fbf2b 2 1 18 b6b？ x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId ':' '，}])； The price of electric cars has dropped many times. Is the quality guaranteed? What impact will the "network toilet" have? Is Huaqiang North's second-hand mobile phone reliable? Why is the cost of cancer treatment getting higher and higher? I recommend f.context ('recbrand', [{"img": "\/86D6277F9E2F07083523F69DFB 24B 899A901F20d? x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto "，" url":"/hm.js？ 6859 ce 5a af 00 FB 00387 e 6434 E4 FCC 925 "； var s = document . getelementsbytagname(" script ")[0]； s.parentNode.insertBefore(hm，s)； })(); window . TT = 1720 12544 1；