∴OC=3.y= 14x2+bx-3.
OA = 2OC，
∴OA=6.
∫A = 14 > 0, point a is on the right side of point b, and the intersection of parabola and y axis is C(0, -3).
∴A(6,0).
∴0= 14×36+6b-3，
∴b=- 1.
∴y= 14x2-x-3，
∴y= 14(x-2)2-4，
∴M(2,-4).
A: The analytical formula of parabola is y= 14x2-x-3, and the coordinate of m is (2,-4);
(2) As shown in figure 1, the intersection point M is MH⊥x axis, the vertical foot is H point, the intersection point AC is N point, the intersection point N is NE⊥AM is E point, and the vertical foot is E point.
∴∠AHM=∠NEM=90。
In Rt△AHM, HM=AH=4, which is obtained from Pythagorean theorem.
AM=42，
∴∠AMH=∠HAM=45。
Let the analytical formula of straight line AC be y=kx+b, as can be seen from the meaning of the question
0=6k+b？ 3=b，
Solution: k = 12b =? 3,
The expression of straight line AC is y = 12x-3.
When x=2 and y=-2,
∴N(2,-2).
∴MN=2.
∠∠NEM = 90 degrees, ∠NME=45 degrees,
∴∠MNE=∠NME=45，
∴NE=ME.
In Rt△MNE,
∴NE2+ME2=NM2，
Me = ne = I have praised it and stepped on it. What's your comment on 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 provide free professional consultation through Baidu Law Professional Edition. For other similar problems, as shown in the figure, the parabola Y =- 1/2x in the plane rectangular coordinate system xOy? +bx+c and x axis intersect at a (1 0), b (5 5,02017-12-16 (2014? In the plane rectangular coordinate system (as shown in the figure), it is known that the parabola y=23x2+bx+c intersects the X axis at points A (- 1, 0) and B, and intersects the Y axis at 3320 12-04-29. As shown in the figure, the parabola y=ax2+bx-2 intersects the X-axis at A, as shown in the figure, the straight line y=4x+4 intersects the X-axis and the Y-axis at two points B and C, and the parabola y=ax2-2ax+c(a≠0) passes through two points B and C, 282017-/kloc. As shown in the figure, the parabola y=x2+bx-c passes through the two intersections a and b of the straight line y=x-3 and the coordinate axis, and this parabola and the x axis 42016-12-01(2013? Shanghai) as shown in the figure, in the plane rectangular coordinate system xOy, the parabola Y = AX2+BX (a > 0) with m as the vertex passes through points A and12013-12-13 on the positive semi-axis of the X axis, as shown in the figure, in the plane rectangular coordinate system xOy, 620 13-09- 17 as shown in the figure, in the plane rectangular coordinate system xOy, it is known that the parabola Y =-x 2+2x+3 intersects with the X axis at two points A and B, and point M throws more than six similar problems here. & 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 = 1720069478；