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Question 115684: I have a test tomorrow and am having a lot of trouble with quadratic equations. i understand some things, but others do not make sense at all. below are 3 problems that i do not understand how to solve. if you could solve the problems and show the steps, that would really help me a lot.
1. 3x^2 + 9 = 0
2. 2x^2 - 14x - 10 = 0
3. -2u^2 + 6 = 3u^2 - 10u

i attempted problem one and the answer i ended up with was x = the square root of 3. i thought for those types of problems there were supposed to be two answers though, like x + sq. root three and x equals (another number)
Click here to see answer by jim_thompson5910(28595)

Question 115710: x^2-x-13=0
Click here to see answer by jim_thompson5910(28595)

Question 115722: I have a test tomorrow and am having a lot of trouble with quadratic equations. i understand some things, but others do not make sense at all. below are 3 problems that i do not understand how to solve. if you could solve the problem and show the steps, that would really help me a lot.
1. 2x^2 - 14x - 10 = 0 (must be solved by factoring or by completing the square, cannot use the quadratic formula)

Click here to see answer by jim_thompson5910(28595)

Question 115709: 8=1-7x^2
Click here to see answer by Gator Tutoring(5)

Question 115783: A projectile is thrown upward so that the its distance above the ground after t seconds is h(t)=-16t^2+308t
After how many seconds does it reach its maximum height?
What is that maximum height?
The area of a square is numerically 12 more than the perimeter. Find the length of the side?
These two problems are really hard can anyone help.
Click here to see answer by bucky(2189)

Question 116123: I have tried to do this equation but I'm having trouble with it. Can you please help me? Solve and graph the equation.
y= -3x^2 + 6x - 2
Click here to see answer by solver91311(16885)

Question 116122: Please can you help me with this equation, I've been working it out but I'm not able to get the right answer. Graph and solve the equation.
y= x^2 - 4
Click here to see answer by bucky(2189)

Question 116013: Find a quadratic equation with roots (4 + i) and (4 - i).
Click here to see answer by ankor@dixie-net.com(15652)

Question 116197: How do you find if an equation has 2 real number solutions, 1 real solution or no real-number solutuons? an example is x^2-6x+c=0
Click here to see answer by jim_thompson5910(28595)

Question 116449:
The length of a rectangle is four times the width. The area is 144 in.^2. Find the length and the width. Show your work.
Click here to see answer by checkley71(8403)

Question 116458: THE CHART BELOW SHOWS THE NUMBER OF BOOKS READ IN A MONTH IN EACHOF MRS. GRAHAM'S LANGUAGE ARTS CLASSES.

1ST PERIOD 68 2ND PERIOD 72 3RD PERIOD 53 4TH PERIOD 77 5TH PERIOD 57
WHAT IS THE MEAN NUMBER OF BOOKS READ PER CLASS?
THE MEDIAN NUMBER OF BOOKS LIES IN WHAT CLASS PERIOD?
DOES A MODE EXIST FOR THIS SET OF DATA? WHY OR WHY NOT.
Click here to see answer by checkley71(8403)

Question 116500: Cindy averaged 60 mph on a trip to Chicago. Returning home she took a more scenice route and averaged 50 mph. The return trip was 2 hours longer and was 30 miles farther. How long did it take Cindy to drive to Chicago?
Click here to see answer by stanbon(57347)

Question 116503: The sum of angles of a triangle is 180 degrees. The first angle is 12 degrees more than half the second angle. The third angle is 19 degrees less than 4 times the second angle. What is the measures of all three angles?
Click here to see answer by princess08(3)

Question 116737: quadratic function in standard from of
(0,3) (1,-4) (2,-9)
Click here to see answer by stanbon(57347)

Question 116766: Find a quadratic equation with the given roots: -1/4 and 1/5.
Click here to see answer by stanbon(57347)

Question 116762: Hi I need help with a few math problems. I was sick when the teacher gave us the lesson. Im really confused. I will try to explain the problems as best I can.
First problem is Solved By using the Quadratic Formula
1) 4p^2 - 7p = -3
I have no idea what to do in this situation. I know you prefer if I try. But I honestly dont know where to start.
The second Problem is Findind the vertex.
y=x^2 + 2x + 2
Im pretty sure I did this wrong.
I got -1 but im not sure how I got it. The teacher marked it wrong, prolly cause I didnt show all the steps. (shes givin us an opportunity to correct problems)
The third problem is For the parabola
y=x^2 - 6x +8
Find the x intercepts
After doing the work (i prolly did it wrong) I got (x-4)(x-2)=0
and my final answer was x=2, x=4
If you could show the steps to this problem, as well as the others I would really appreciate it. Again any help you guys could give me I would really appreciate it.
Click here to see answer by jim_thompson5910(28595)

Question 116754: A stamp collection consists of 5, 13, and 18 cent stamps. The number of 13 cent stamps is one less than twice the number of 5 cent stamps. The number of 18 cent stamps is five more than the number of 13 cent stamps. The total value of all the stamps is $2.60. Find the number of 13 cent stamps in the collection.
Here is what I have so far:
.05x + .13(2x+1) + .18((2x+1)-5)=2.60
Am I anywhere close? Can you help me solve?
Click here to see answer by edjones(7569)

Question 116786: I am guessing this would be Geometry. I am not good at word problems. My son who thinks he is so smart, really is. So every now and then he will come in and pose a question for me to figure out the answer. I really would prefer you not post this. I would just like to know the answer please so I can go back to him. I have part of it figured out just not sure about the very last part?
Question is this> The length of a rectangle is 2 cm more than 3 times its width. If the area of the rectangle is 96cm squared, find the dimensions of the rectangle to the nearest thousandth.
Okay I figured it to this point 96=3w²+2w which can be written as 0=3w²+2w-96 By putting it in your quadratic equation solver I came up with 5.333 So do I just multiply the width 5.333 by 3 and then add 2 to get the dimensions Width=5.333cm and Length=17.999cm?
Click here to see answer by edjones(7569)

Question 116895: I am in an online math class and have an ebook. I have tried to figure this out by using the animated help, video help, and the step by step but I still cant figure it out because I can not figure out how the step by step goes from one step to the next.
The problem is- f(x)=1/7x^2
It tells me to find the vertex and the equation of the line of symmetry. Then to graph the function.
Please assist me with this

Click here to see answer by checkley71(8403)

Question 116981: x squared+8x+25=o
choose one of the following as the answer
A)-4+6i, -4-6i
b)4+3i, 4-3i
c)4+6i, 4-6i
d)-4+3i, -4-3i
Click here to see answer by jim_thompson5910(28595)

Question 116988: Can you pleae assist me with my childs homework. I have forgotten how to solve this type of problem. Thank you very much.
The length of a rectangle is 1 cm longer than it width. If the diagonal of the rectangle is 5cm, what are the dimensions of the rectangle in centimeters?
Width=_______cm Length=________cm
Click here to see answer by jim_thompson5910(28595)

Question 117090: Divide: 5x^3-5x+1 by x-3
I tried factoring out the 5 and ended up with 5(x^2-x-3)+x as the answer
Am I anywhere close?????
Click here to see answer by jim_thompson5910(28595)

Question 117254: SOLVE AND GRAPH THE SOLUTION SET OF EACH OF THE FOLLOWING INEQUALITIES
7(x-3) > 5x - 14
Click here to see answer by jim_thompson5910(28595)

Question 117290: Find two consecutive positive intergers such that the sum of their square is 85.

Click here to see answer by checkley71(8403)

Question 117292: A garden area is 30ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400ft^2, what is the width of the path?
Click here to see answer by scott8148(6628)

Question 117315: Can you help me with this problem? A parabola has vertex (8,3) and one x-intercept. Determine the coordinates of the other x-intercept.
Click here to see answer by Fombitz(13828)

Question 117427: I am having some troubles with solving for the variable in equation
What I have so far is......
2(y-1)(y-)=4(y+1)(y+1)
2(y^2-y-y-1)=4(y^2+y+y+1)
2y^2-2y-y2-2=4y^2+4y+4y+4
2y^2-4y-2=4y^2+8y+4
But i can not get any further....can you please help
Thank you so much!!!!
Click here to see answer by josmiceli(9678)

Question 117535: How do you solve 2n^2-4n=6 and then put it into a table or graph?
Click here to see answer by checkley71(8403)

Question 117535: How do you solve 2n^2-4n=6 and then put it into a table or graph?
Click here to see answer by stanbon(57347)

Question 117534: How do you write and the f(x)=(x+5)(2x-9) equation in to standard form?
Click here to see answer by stanbon(57347)

Question 117534: How do you write and the f(x)=(x+5)(2x-9) equation in to standard form?
Click here to see answer by solver91311(16885)

Question 117553: How do you factor completely 8n^2-2?
Click here to see answer by edjones(7569)

Question 117555: How do I solve x^2+6x+4=0 in quadratc formula?
I think this is how to slove x= -6+or-√6^2-4(x)(4)/2(x)
-6+or-√36-4(x)(4)/2(x)
-6+or-√36-16/2(x)
-6+or-√20/2
Click here to see answer by jim_thompson5910(28595)

Question 117548: How do you solve by factoring x^2-3x-10=0
Click here to see answer by jim_thompson5910(28595)

Question 117550: How do you rewrite the equation y=x^2+6x+4 in vertex form by using the concept of completing the sqaure.
Click here to see answer by edjones(7569)

Question 117549: How do you put 2n^2-4n-6=0 in to a graph or table . Round to the nearst tenth
Click here to see answer by jim_thompson5910(28595)

Question 117547: How do you factor 8x^3y-3xy^2=xy^4 step by step
Click here to see answer by MathLover1(6632)

Question 117633:
Write the equation of the line with x-intercept (–2, 0) and undefined slope.
Click here to see answer by checkley71(8403)

Question 117633:
Write the equation of the line with x-intercept (–2, 0) and undefined slope.
Click here to see answer by bucky(2189)

Question 117747: graph the exponential functions
a.)f(x)=2*(1/2)
b.)k(x)=3*(1/3)
c.)h(x)=3*(3)
d.)g(x)=5*(1.2)
Click here to see answer by josmiceli(9678)

Question 117748: sketch the graph of the following functions
f(x)=-2*(3)^x and g(x)=4*(1/3)^x
Click here to see answer by jim_thompson5910(28595)

Question 117839: factor 8x^3y-3xy^2+xy^4
Click here to see answer by jim_thompson5910(28595)

Question 117843: 8x^3y-3xy^2+xy^4 ok I am at the part were you have 8x^2-y(y^2-3)= 0 but I dont know the steps after that
Click here to see answer by stanbon(57347)

Question 117858: x2 - 3x =4
Click here to see answer by jim_thompson5910(28595)

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