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

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

 Question 137215: Solve using the quadratic formula: x^2-3x=-6x-1 Click here to see answer by checkley77(12569)

 Question 137219: Solve the problem by completing the square x^2 + 10x = 7 Click here to see answer by checkley77(12569)

 Question 137221: Solve the problem by using the quadratic formula 6w^2 + 9w - 1 Click here to see answer by checkley77(12569)

 Question 137100: what is the value of x when xcube + 3x = 47 The question says that it has a solution between 3 and 4. what does this mean. what should i take the value of a? i have got the answer 5.52 and -8.52. is it right What would happen if the question was like below 4xcube + 3x=20 what should i take the value of a is it 4?? and what should i do with the cube? does it affects the formula Click here to see answer by vleith(2825)

 Question 137172: solve by completing the square: 2x^2-x-5=0 Click here to see answer by ankor@dixie-net.com(15623)

 Question 137253: What is the solution to x^2-2x+5=0 when you use complex numbers. I always end up with 1-2i and 1+2i but when I put those into the equation to check it, it doesn't come out to be 0. Is that because it is a complex number and there truly is no solution? This question did not come from a textbook but from a worksheet from the tescher. The text we use is the Glencoe Algebra 2 text. It didn't help when I tried to follow the examples given. Click here to see answer by stanbon(57214)

 Question 137334: Solve the problem. The profit that the vendor makes per day by selling x pretzles is given by the function P(x) = -0.002x squared + 1.2x - 300. Find the number of pretzels that must be sold to maximize profit. Click here to see answer by stanbon(57214)

 Question 137231: the speed of the airplane in still air is 186mph. the plane travals 538 mi againt the wind and 1415 mi with the wind in a total time of 12 hr. what is the speed of the wind Click here to see answer by checkley77(12569)

 Question 137426: what if there is no c factor when using the quadradic formula to solve an equation? Click here to see answer by oscargut(891)

 Question 137457: I would really appreciate it if I could get some help on this question, thanks. The path of a falling object is given by the function s=-16t^2+vo+s0 where vo represents the initial velocity in ft/sec and so represents the initial height in feet. Also, s represents the height in feet of the object at any time,t,which is measured in seconds. If a rock is thrown upward with the initial velocity of 40ft per second from the top of a 30ft building. s= -16t^2+vot+so I figured out that much, then it asks after how many seconds will the graph reach maximum height?What is the maximum height? I just need help setting up the equation to solve for height.... The question comes from my online algebra class at aiu. HELP PLEASE. thanks, alaska Click here to see answer by Earlsdon(6287)

 Question 137437: Solve for x 2(x-4)-(x+2)=(x+2)(x-4) Click here to see answer by checkley77(12569)

 Question 137456: I would really appreciate it if I could get some help on this question, thanks. The path of a falling object is given by the function s=-16t^2+vo+s0 where vo represents the initial velocity in ft/sec and so represents the initial height in feet. Also, s represents the height in feet of the object at any time,t,which is measured in seconds. If a rock is thrown upward with the initial velocity of 40ft per second from the top of a 30ft building. s= -16t^2+vot+so I figured out that much, then it asks after how many seconds will the graph reach maximum height? I just need help setting up the equation to solve for height....The question comes from my online algebra class at aiu. HELP PLEASE. thanks, alaska Click here to see answer by scott8148(6628)

 Question 137491: Solve the system of equations by graphing. Then classify the system as consistent or inconsistent; and the equations as dependent or independent. 3u+v=18 3u=v+30 Help what is up with th u and v I do not understand. Click here to see answer by stanbon(57214)

 Question 137492: Solve the system of equations by graphing. Then classify the system as consistent or inconsistent; and the equations as dependent or independent. y= -x-12 8x-7y=9 Again can someone help me with this one. This class is getting so much harder than I ever expected. Click here to see answer by stanbon(57214)

 Question 137495: Solve by the substitution method. 7m + n= 12 m - 8n= 18 Help me please. This chapter is just aweful for me I understand hardly anything. Click here to see answer by oscargut(891)

 Question 137502: Solve by the elimination method. x+8y=29 -x+3y=4 I do not understand this 'elimination method', can someone please help me?? Click here to see answer by oscargut(891)

 Question 137500: Solve by the substitution method. 4x+7y = 35 -3x+y = 30 Can someone please help me with this. Click here to see answer by oscargut(891)

 Question 137504: The perimeter of a rectangle is 108 inches. The length exceeds the width by 8 inches. Find the length and the width. Again please help me. Click here to see answer by oscargut(891)

 Question 137489: Solve the system of equations by graphing. Then classify the system as consistent or inconsistent; and the equations as dependent or independent. x+y=5 x-y=-1 What is the solution of the system of equations. Please help me with this. Click here to see answer by oscargut(891)

 Question 137503: Solve by the elimination method. 0.3x - 0.2y = 4 0.5x + 0.5y = -45/17 (this is a fraction that is -) I have no idea how to solve this, what do i do with that fraction? Help please. Click here to see answer by stanbon(57214)

 Question 137501: The perimeter of a rectangle is 144 m. The length is 9 m more than twice the width. Find the dimensions. Do I just multiply each (144, and 9m) 2 and that is the answer? Click here to see answer by vleith(2825)

 Question 137499: Solve by the substitution method. 4x+7y = 34 -3x+y = 12 Can someone please HELP me with this problem. I do not understand it at all!! Click here to see answer by checkley77(12569)
 Question 137499: Solve by the substitution method. 4x+7y = 34 -3x+y = 12 Can someone please HELP me with this problem. I do not understand it at all!! Click here to see answer by vleith(2825)

 Question 137490: Solve the system of equations by graphing. Then classify the system as consistent or inconsistent; and the equations as dependent or independent. 3x-y=23 3x+4y=13 HELP Click here to see answer by checkley77(12569)

 Question 137593: Problem: Solve polynomial inequality and graph the solution set on a real number line. (x+1)(x+2)(x+3)>=0 I have set each of the terms to equal 0. x+1=0 x+2=0 x+3=0 x=-1 x=-2 x=-3 Then I placed these three numbers on a number line as boundary points. I used the following test points: -1.5 which was >=0 (true) -2.5 which was not >=0 (false) -4 which was not >=0 (false) 0 which was >=0 (true) I am confused on how to plot this on the number line and write the solution set in set builder notation. I think that I would use [ at -1 and go right, but I am not clear on whether the next point would be set at -2 or -3. I would have [-1, infinity) and ? {xIx>=-1 and ?} Can you help me finish solving this problem. Thank you. Click here to see answer by solver91311(16868)

 Question 137655: Solve by the elimination method. 9x-9y=36 7y-3x= -14 What is the solution of the system? Can someone explain this to me? I do not understand this at all...not of it. Click here to see answer by scott8148(6628)

 Question 137656: Solve by the elimination method. 0.05x+0.25y=11 0.15x+0.05=12 What is the solution of the system? Again can someone explain how I am supposed to do this? I do not seem to understand anything that anyone has said. I am getting soooooo aggrevated. Click here to see answer by ankor@dixie-net.com(15623)

 Question 137741: Please help me solve this problem: f(x) = x^2-4x /2x^3 +2x^2-12x. The first section up to the 4x is on top of the fraction bar and everything else after it is below the fraction bar. Click here to see answer by stanbon(57214)

 Question 137765: x^2-3x=-6x-1 Click here to see answer by checkley77(12569)

 Question 137736: 1-4w^2=w^2+11 Click here to see answer by checkley77(12569)

 Question 137704: Please solve and explain this quadratic equation. I still don't quite understand how to solve and graph it. thanks! y=(x-3)^2-5 Click here to see answer by ankor@dixie-net.com(15623)

 Question 137834: How do you find a quadratic equation if you are only give the solution? Is it possible to have different quadratic equations with the same solution? Explain. give an example. Thanks, ts Click here to see answer by stanbon(57214)

 Question 137833: Describe what the graph of interval [-4,10] looks like. Can someone please help me with this. I am supposed to explain this in 50 words. How do i write something in words that i barely can do with the numbers??? Please help. Click here to see answer by stanbon(57214)

 Question 137867: A lumber company can convert logs into plywood or lumber. The mill turns out twice as many units of plywood as lumber. It makes a profit of \$25 on a unit lumber and \$50 on a unit of plywood. How many of each unit must be produced in order to make a profit of \$12750? The lumber company must produce and sell ?? units of lumber and ?? units of plywood to make a profit of \$12750. I am so bad with word problems also, can someone help. Click here to see answer by stanbon(57214)

 Question 137933: The volume of a square pyramid is given by the formula V=1/3hx(to the 2nd power), where h is the height of the pyramid and x is the length of one side of the base. A pyramind with a height of 15 ft. has a voulme of 2880 ft. (to the 3rd power) What is the length of one side of the base? Click here to see answer by vleith(2825)

 Question 137938: Please help me solve the quadratic equation. I Have to show whether concave up or concave down? Thanks! y= -(x-2)^2 Click here to see answer by dolly(163)

 Question 137880: The college paid \$1718 for an order of 47 calculators. The store paid \$10 for each scientific calculator. The others were all graphing calculators these calculators cost \$58 each. How many of each type a calculator were sold? Help again please, no clue how this is done. Click here to see answer by ankor@dixie-net.com(15623)

 Question 137937: Please help me solve the quadratic equation. I Have to show whether concave up or concave down? Thanks! y=(-X^2+4X+5) Click here to see answer by checkley77(12569)

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