# Questions on Algebra: Quadratic Equation answered by real tutors!

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 Quadratics: solvers Practice! Answers archive Lessons Word Problems In Depth

## Tutors Answer Your Questions about Quadratic Equations (FREE)

 Question 438128: Find the x-intercepts of the graph of the equations. y=x^2-1 y=x^2-2x+35 y=x^2-3x+2 Click here to see answer by robertb(4012)

 Question 438182: Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form, ax^2+bx+c=0 Solution:8, only solution Click here to see answer by robertb(4012)

 Question 438360: I am working on a quadratic equation. A=3, B=6, C=-4. I have worked the problem out to the point that x=-6 + sqrt 84. I reduced the problem to -6+2(sq rt 21) over 6. The text key says that it can be further reduced to -3+sqrt21 over 3, but I just cannot see how they get from my answer to theirs. Can you explain? Click here to see answer by nerdybill(7009)

 Question 438421: Solve: 10x^2 = 20x+30 What are the solutions to the equation? Can someone please help me with this? Thanks Click here to see answer by josmiceli(9817)

 Question 438428: How would you solve the problem: The height of a ball is measured by the function h(t)=-16t^2+112t-64, where h(t) is measured in feet and t is time in seconds. (a) Evaluate h(2) and explain what dependent and independent variables represent. (b) What is the height of the ball at 3 seconds? (c) When is the ball at a height of 128 ft.? Click here to see answer by Alan3354(31538)

 Question 438431: Solve the indicated variable. A=P(2+r)^2. r=? That should be the power of 2. I'm not sure how to start. I know I have to get the r by itself but the P is throwing me off. If the P wasn't there I would have squared both sides. Any help would be greatly appreciated. Click here to see answer by Alan3354(31538)

 Question 438629: what is the quadraric funtion that fits each set of data points. (1,-2) (-1,8) (2,-1) The equation I came up with is: (f(x)=-2/3x^2-5x-3) Thank you! Click here to see answer by stanbon(57984)

 Question 438654: The question asks students to graph y=-x^2+4x+1 and to have all x intercepts and y intercepts labeled. I have figued out that the vertex is (2,5), the y intercept is (0,1) and I have worked out the problem to get points of (2,5) & (-1,-4) I am having an issue figurng out exactly what the points are when the lines cross the x axis. Thank you for your help. Click here to see answer by stanbon(57984)

 Question 438511: I need a quadratic equation with the results being -5,7......Is there anyway I can graph this in excel? Thanks! Click here to see answer by richard1234(5390)

 Question 439119: simplify -4(m-5) Click here to see answer by stanbon(57984)

 Question 439268: what is quadration equation ?give an example and explain it fully plz! Click here to see answer by rwm(914)

 Question 439340: I am no good at word problems, is there anyone who can help me with the problem below? The cumulative number of car accidents from 2000 to 2010 can be modeled by the quadratic expression C= 25x^2 + 550x +7,300, where x=1 corresponds to 2000, x= 2 corresponds to 2001, and so on until x = 11 corresponds to 2010. Find the number of car accidents in 2004 ? Thank you so much. Click here to see answer by jorel1380(2518)
 Question 439340: I am no good at word problems, is there anyone who can help me with the problem below? The cumulative number of car accidents from 2000 to 2010 can be modeled by the quadratic expression C= 25x^2 + 550x +7,300, where x=1 corresponds to 2000, x= 2 corresponds to 2001, and so on until x = 11 corresponds to 2010. Find the number of car accidents in 2004 ? Thank you so much. Click here to see answer by stanbon(57984)

 Question 439434: 1. If a projectile is launched with an initial velocity of feet per second from an initial height of feet, then its height in feet is determined by the quadratic function where t is the time in seconds. When you graph the function you will have the parabolic shape where the maximum point is called the vertex. If a ball is tossed upward with velocity 64 feet per second from a height of 5 feet, the function to represent the height at any time t is given with the equation s(t)=-16t^2+64t+5 a) In how many seconds will the ball reach the maximum height? (5 pts) b)What is the maximum height in feet that the ball reaches? (5 pts) Click here to see answer by lwsshak3(6764)

 Question 439454: A projectile is launched straight up with an initial volocity of 96 ft per sec. How many seconds to reach 144 feet? 2.5 sec, 3 sec, 3.5 sec, or 4 sec?? Thanks Click here to see answer by stanbon(57984)

 Question 439435: 2.The area of a rectangular tabletop is 6 square feet. If the width is 2 feet shorter than the length, then what are the dimensions? (You will need to use either completing the square or the quadratic formula. Round your answers with a calculator to 2 decimal places) Click here to see answer by Gogonati(817)

 Question 439455: Adjacent sides of a rectangle differ by 5 ft. If the area of the rectangle is 84 sqft., what is the length of the smaller side? Thanks!! Click here to see answer by stanbon(57984)

 Question 439522: Hello my name is ChristopherI am hoping you can help me on this HW problem... Solve equation by putting in quadratic form (Use a U substitution)....? Very confused could you please help me ? thankyou 4x^4-7x^2+3=0 Click here to see answer by stanbon(57984)

 Question 439519: Hello my name is ChristopherI am hoping you can help me on this HW problem... Given the equation Y=-2x^2-4x+6 a) Maimum or minimum? b) Find Vertex c) Axis of Symmetry? d) Y-int? Click here to see answer by Gogonati(817)

 Question 439686: If a quadradic equation can be solved, how many solutions are there? Click here to see answer by asuar010(324)
 Question 439686: If a quadradic equation can be solved, how many solutions are there? Click here to see answer by solver91311(17077)

 Question 439691: The height of a ball launched from the top of a hill, where t is time, is (5t-3)(6-t)=h. If h=0, when the ball hits the ground, how long does it take for the ball to hit the ground? Click here to see answer by solver91311(17077)

 Question 439745: how do I solve this quadratic equation by factoring? Click here to see answer by stanbon(57984)

 Question 439757: Click here to see answer by edjones(7569)

 Question 439752: Click here to see answer by jorel1380(2518)

 Question 439842: one of the roots of the equation x^2+3 x-18 = 0 is 3. what is the other root? Click here to see answer by MathLover1(6813)

 Question 439887: Solve (round to the nearest millionth): ln(13-12x)=5 Click here to see answer by Alan3354(31538)

 Question 439893: Solve and Round to the nearest millionth? log[4]x+log[4](x-5)=0 Click here to see answer by stanbon(57984)

 Question 439903: Please I need some extra help with this problems!! Graphing Parabolas, for example this y= -x^2-2x+1? please explain me how you do it? Thanks, Brian Click here to see answer by stanbon(57984)
 Question 439903: Please I need some extra help with this problems!! Graphing Parabolas, for example this y= -x^2-2x+1? please explain me how you do it? Thanks, Brian Click here to see answer by MathLover1(6813)

 Question 439894: Solve and round to the nearest millionth?! 5^(x)=8 Click here to see answer by Alan3354(31538)

 Question 439939: Please help. I am not sure how to apply the quadratic formula to this when the "a" "b" and "c" are not in the correct order. Click here to see answer by josmiceli(9817)

 Question 439993: Describe the change in y=x^2 for each equation. y=(x-6)^2 The phrase "Describe the change..." confuses me. Is this the same as solving? Should I be changing the equation to: (x-6)^2-y=0 Click here to see answer by richard1234(5390)

 Question 439165: Often in personal finance we want to know what our \$1 investment today will be worth in 20 years. In business however, there is more concern with answering the question, “If I receive \$100 in 5 years, what is that worth today?” To answer this question, modify the formula fv = pv*((1+i)^n) and use the reciprocal. Simply stated, the reciprocal of a number is 1 divided by the number; the reciprocal of 10, for example, is 1/10. In the formula above, we divide both sides by ((1+i)^n), which creates a new formula where the fv is multiplied by the reciprocal of the original: fv*(1/((1+i)^n))=pv. Select an interest rate and number of periods—be sure your numbers are different from other students who already answered this question—to calculate the present value of \$100 received in the future. What would the value of \$100 in the future be today given the interest rate and number of periods you selected? Click here to see answer by robertb(4012)

 Question 440253: Need help solving this quadratic equation -.01x^2 +30x - 3500 =0 Thanks Click here to see answer by jorel1380(2518)

 Question 440323: I don't understand how to solve quadratic equations by graphing. For example, how would you graph x^2 +6x+9=0? Please give me a step-by-step method. Thank you! Click here to see answer by rwm(914)

 Question 440347: Find an equation where ax^2+bx+c=0 with solutions of 2/5 and -5. Could you please answer within the hour? Thank you. A calculus teacher thought this would be fun homework worth a test grade. Please help!!! Click here to see answer by richard1234(5390)

 Question 440331: Find an equation where ax^2+bx+c=0 with solutions of 2/5 and -5. Click here to see answer by nerdybill(7009)

 Question 440434: The length of a rectangle is eight-fifths times the width. The are is 160. What are the dimensions of the rectangle? Click here to see answer by unlockmath(1614)

 Question 440466: A perimeter of a rectangle is 8 meters and its area is 3.84 m. What are the dimensions? Click here to see answer by edjones(7569)

 Question 440477: In a quadratic equation-standard, vertex, and factored form-how do you calculate the 'a'? ex: I know part of the equation of a parabola- y=a(x+7)(x+3). so what's 'a'? Click here to see answer by richard1234(5390)
 Question 440477: In a quadratic equation-standard, vertex, and factored form-how do you calculate the 'a'? ex: I know part of the equation of a parabola- y=a(x+7)(x+3). so what's 'a'? Click here to see answer by lwsshak3(6764)

 Question 440659: Find the vertex, the line of symmetry, and the maximum or minimum value of the quadratic function,and graph the function. f(x)=4x^2-32x+66 Click here to see answer by solver91311(17077)

 Question 440673: Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form,ax^2+bx+c=0 The solutions are -10,2. Click here to see answer by solver91311(17077)

 Question 440741: Please help me solve the equation (2x-1)^2=121.Can you please show me the steps to solving this problem. Thank you very much. Click here to see answer by Alan3354(31538)

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