(? 3)22? 3b+c=0c=？ 32? Solve? b= 1c=？ 32
So the expression of parabola is y = 12x2+x-32.
The coordinates of its vertex P are (-1, -2)...( 1).
(2) Extend the intersection of AP and Y-axis to G, with C as CH⊥AG and vertical foot as H. 。
Let the expression of straight line AP be y=kx+b,
Substitute a (-3,0) and p (- 1, 2) to get.
? 3k+b=0？ k+b=？ 2. The solution is k =? 1b=？ 3.
∴y=-x-3.
Then we can get G(0, -3).
∴OG=OA,∠G=∠OAG=45，
In Rt△CHG, HG=CH=CG? sin45 =324。
At Rt△AOG, ag = ogcos 45 = 32,
∴AH=AG-HG=924
∴tan∠CAP=CHAH= 13.
(3) Let Q(t, 12t2+t-32),
If q is in the fourth quadrant, |t|=t, |12t2+t-32 | =-12t2-t+32).
Connect OQ, is it easy to get? S△QAC=S△AOC+S△QOC-S△AOQ。
∫S△AOC = 12××|-3 |×|-32 | = 94，S△QOC = 12××|-32 |×t = 34t
s△AOQ = 12×|-3 |×| 12t 2+t-32 | =-34t 2-32t+94、
∴ s △ qac = 94+34t-(-34t2-32t+94) = 34t2+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 consult other similar problems free of charge through Baidu Law Pro 20 12-04-27. As shown in the figure, it is known that the plane rectangular coordinate system xOy and parabola y=-x2+bx+c intersect the X axis at A (-/Kloc) through points A (4,0) and B (1 3) 3660.00000000000001+BX+C (A > 0). The parabola passing through point A, point C and point B is 35020 12-05-27. As shown in the figure, it is known that the parabola Y =-x2+BX+C of the plane rectangular coordinate system passes through points A (4 4,0), B (65438. +bx+c passes through two points, a (0,3), B( 1)B(0), and the vertex is 3020 14-0 1-27. As shown in the figure, in the plane rectangular coordinate system xoy, the parabola ax2+bx+c passes through ABC three points, and the point A (-3,0) is known. Shanghai) 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 33. More similar questions? & 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 ':' '，}])； Is Huaqiang North's second-hand mobile phone reliable? Why is the cost of cancer treatment getting higher and higher? What impact will the "network toilet" have? The price of electric cars has dropped many times. Is the quality guaranteed? 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 = 172003 1055；