# Questions on Algebra: Conic sections - ellipse, parabola, hyperbola answered by real tutors!

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 Algebra: Conic sections - ellipse, parabola, hyperbola Solvers Lessons Answers archive Quiz In Depth

 Question 229396: i am trying to find the y coordinate of the vertex. the x is -2 and when i plug it in to the equation i get 3(-2)^2+12(-2)+8 =-28, but the answer is supposed to be -4 can someone tell me what i am doing wrong? Click here to see answer by rfer(12654)

 Question 229725: Find the x and y intercepts of a circle with a radius of 3.46 and (-4,5) Click here to see answer by solver91311(16872)

 Question 230599: y = √x, [16, 25] Calc I its asking to find c usting MVT Click here to see answer by solver91311(16872)

 Question 231995: Find the x-intercepts of the parabola with vertex (6,-5) and y-intercept (o,175). Write your answer in this form: (x1,y1),(x2,y2). If necessary, round to the nearest hundredth. Click here to see answer by josmiceli(9664)

 Question 232715: can you please help be with these problems.find the (x,y)value of the vertex of the parabola, y=x^2-16 find the (x,y0value of the vertex of the parabola, y=x^2+6x+5 Click here to see answer by nerdybill(6951)

 Question 233299: The vertex of this parabola is at (4, -3) what the equation Click here to see answer by rfer(12654)

 Question 233394: sketch the portion of graph in the first quadrant and use symmetry to complete the rest of the graph 4x^2+16y^2=16 Click here to see answer by Edwin McCravy(8893)

 Question 233345: Hello. I am having a question in the CPM Algebra 2 book on pg.179. My chapter, that I am on, is about parabola equations. You can find the problem and any diagrams on hotmath.com. The question is this... 4-47 "A jackrabbit is jumping over a three-foot-high fence. To clear the fence, the rabbit must start its jump at a point four feet from the fence and will end four feet from the fence" When drawing this graph and making an equation, I am unsure where to go about this problem, to write this equation. Please help. Much appreciated:) Click here to see answer by Theo(3458)

 Question 235866: Hello, I am struggling on ellipses and hyperbolas. I need some help on differentiating the two. How can you tell which is which? Click here to see answer by Alan3354(30993)

 Question 235864: x^2-4x-21=0 we must find Δ in oder to know in which conditions this equation must be solved. Δ=((-b)^2-4*a*c) (*)if Δ>0 this equation has 2 solutions x=(-bą√Δ)/2a. (**)if Δ=0 this equation has only one solution x=-b/2a. (***)if Δ<0 this equation must be solved by a transformation of Δ to a complex number. if we apply Δ's formula: Δ=(-(-4))^2-4*(-21)=100 then Δ>0 so we must refered to condition(*)in oder to solve this equation. √Δ=10 this equation has 2 results x1,x2. x1=(-(-4)-10)/2; x2=(-(-4)+10)/2 x1=-3;x2=7 S={-3;7} Click here to see answer by checkley77(12569)
 Question 235864: x^2-4x-21=0 we must find Δ in oder to know in which conditions this equation must be solved. Δ=((-b)^2-4*a*c) (*)if Δ>0 this equation has 2 solutions x=(-bą√Δ)/2a. (**)if Δ=0 this equation has only one solution x=-b/2a. (***)if Δ<0 this equation must be solved by a transformation of Δ to a complex number. if we apply Δ's formula: Δ=(-(-4))^2-4*(-21)=100 then Δ>0 so we must refered to condition(*)in oder to solve this equation. √Δ=10 this equation has 2 results x1,x2. x1=(-(-4)-10)/2; x2=(-(-4)+10)/2 x1=-3;x2=7 S={-3;7} Click here to see answer by cheikoda(2)

 Question 236835: how to find the equation of the circle having AB as diameter where A is the point (1,8) and b is the point (3,14) Click here to see answer by checkley77(12569)

 Question 237370: write an equation in standard form of the parabola that has the same shape as the graph of , but which has a maximum of at . Click here to see answer by Edwin McCravy(8893)

 Question 237858: Okay, so what is a eauation for a line of symmetry for (x-2)(x-2) also what are you equations for parabolas, with (2,0) as a vertex. anyways i dont want you tto tell me the anwer i wannt to know how to answer, so it will help me thanks :D Click here to see answer by solver91311(16872)

 Question 237815: I am given the length, and height of a parabola which is positioned like a bridge, therefore the parabola's opening is downwards. The Length of the base of the parabola is 5meters, the height is 4meters. I need to find the maximum height of a rectangle to fit into the parabola(bridge). The rectangle cannot be the height of the parabola, and the edges cannot go past the parabola. The Width of the rectangle is 2meters. What is the maximum height of the rectangle so that it would fit through the parabola, without getting stuck? How would you write the equation of the parabola? Would it be y= -a(x-4)^2+0 ?? Is the vertex (0,4) ? Click here to see answer by ankor@dixie-net.com(15645)

 Question 238389: can you tell me how to convert a parabola into an equation... x intercepts are (3,0) and (13,0) how do i find the vertex if thats all the info i have... Click here to see answer by Theo(3458)

 Question 238483: What is the domain and range to this function: 16y^2/9 + 4x^2/25 = 1 Click here to see answer by stanbon(57282)

 Question 239020: Find the center and the radius of the circle x+1 squared + y+4 squared =81. Click here to see answer by Theo(3458)

 Question 239117: A volleyball is hit upward by a player in a game. The height (h) (in feet) of the volleyball after (t) seconds is given by the functin h=-16+30t+6. What is the maximum height on the volleyball? Click here to see answer by nerdybill(6951)

 Question 239121: What is the greatest zero of the function Click here to see answer by jsmallt9(3296)

 Question 239174: what is the real part of the standard form of the expression (5+i)(10-i) Click here to see answer by ankor@dixie-net.com(15645)

 Question 239273: y^2-8y-8x-8=0 Find the equation of the axis. find the coordinates of the vertex. find the coordinates of the focus. find the equation of the directrix Click here to see answer by Photonjohn(42)

 Question 239721: Identify the coordinates of the vertex, and focus, the equations of the axis of symmetry and directirix, and the directions of opening of the parabola with the given equation. Then find the length of the latus rectum and graph the parabola. -2(y-4)=(x-1)^2 I'm confused on each part, in general. Can you help me on each step? Click here to see answer by stanbon(57282)

 Question 240467: I'm in dire need of help on my Honors pre-calculus assignment. I'm given the foci (3,+-2) and the x intercepts of -1 and 7 . How do I find the equation of the conic (parabola, hyperbola, or ellipse) described? Click here to see answer by scott8148(6628)

 Question 241398: x^2+y^2=2x-2y=2 What type of conic is this? What is the standard form of this equation? Click here to see answer by rapaljer(4667)

 Question 241771: how do you change y=-16x^2+88x+3 to vertex form? Click here to see answer by jim_thompson5910(28536)

 Question 242434: i need to find the vertex, symmentry axis does graph go up or down and graph y=2x^2 +8x + 16 Click here to see answer by stanbon(57282)

 Question 242289: Graph each conic section and state the desired information? Parabola x= y^2 + 8y + 20 Click here to see answer by philline_palana(20)

 Question 242572: Graph each equation. Identify the conic section and describe the graph and its lines of symmetry. Then find the domain and range: Click here to see answer by stanbon(57282)

 Question 242816: I am suppose to graph this conic section how do I do this equation (x+2)=4(y-1)^2 Click here to see answer by Edwin McCravy(8893)

 Question 243722: How would you graph this hyperbola: -(x/6)^2 -(y/6)^2 = 1? Click here to see answer by Edwin McCravy(8893)