Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 27798: Differentitate

y=cosxsinx

I tried doing it by the product rule but it didn't work.
thanks.
Click here to see answer by sdmmadam@yahoo.com(530)

Question 27774: For the function,
Give the y values for x (120+y=240)+30=x
Answer: y=120 x=270
Show work in this space.

b)Using these points, draw a smooth curve.
Show graph here.

Click here to see answer by AnlytcPhil(1277)

Question 27978: Are trinomials in the form ax squared + bx + c , prime polynomials if a,b and c are prime.
Click here to see answer by venugopalramana(3286)

Question 28004: Three parallel lines in a plane are intersected by a fourth line, forming twelve angles. If one of the angles has a measure of 28 degrees, how many of the other eleven angles have a measure of 28 degrees? I'm lost, thanks alot!
Click here to see answer by venugopalramana(3286)

Question 28003: On an xy-coordinate plane, line "L" contains the points (0,0) and (1,2). If line "M" contains the point (0,0) and is perpendicular to line "L", what is an equation of line "M"? Thanks so much!
Click here to see answer by venugopalramana(3286)

Question 28002: Of the 6 courses offered by the music department at her college, Kay must choose exactly 2 of them. How many different combinations of 2 courses are possible for Kay if there are no restrictions on which 2 courses she can choose?
Click here to see answer by venugopalramana(3286)

Question 28001: Can two parabolas be parallel? if so, how?
Click here to see answer by venugopalramana(3286)

Question 28020: 3x=x+12
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28000: Using the quadratic equation x2-3x+2=0 perform the following tasks:
solve by factoring.
solve by completing the square. Since it is x square, should i devide both sides by x?
solve by using the quadratic equasion.

I don't necesarily want it answered, I just need to know how to do these equations.
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28119: Im falling behind in Algebra due to illness. If I could see a problem done for me I could use it as a referance. Any help would be GREATLY appriciated!
Can you please solve the equation by using the "square root method"? Thank you for your time!!!
Click here to see answer by Earlsdon(6287)

Question 28086: show that ((x^2y)/2(x+y))+ ((x+y)/2xy)-(x)^1/2 >= 0 for positive real numbers x and y.
Click here to see answer by josmiceli(9686)

Question 28141: Placing a photograph behind a 12-inch by 12 inch piece of matting. The photograph is to be positioned so that the matting is twice as wide at the top and bottom as it is at the sides. If the area of the photograph is to be 54 square inches, what are the dimensions? I do not understand how to set this up into a quadratic equation.
Click here to see answer by longjonsilver(2297)

Question 28313: The general equation os a quadratic polynomial is p(x)=ax(squared)+bx+c with a,b,c all real numbers and a doesn't = 0. In this problem we show that three points in the plane uniquely determine a quad polynomial, )just as two points in aplane uniquely determine a line).
Step 1. Suppose that we were given the three point (-1,1),(1,5), and (2,10). We want to find the quad poly P(x) which passes through these points. So, evaluate p at each x value. For example, since p(-1)must be 1 (why?), we get
p(-1)=a(-1) squared+b(-1)+c=1 (arrow) a-b+c=1.
Evaluating p(1) and p(2), we get two more equations. What are they?
p(1)=
p(2)=
Step 2: We now have _________________ linear equations in the _______________ unknowns___,__________, and _______. Thus, we can try to solve for _,_____, and ____. Once we have values for ___,______, and __, our polynomials will be determined.
Step 3: set up the augmented coefficient matrix. We can start with
M= [1 -1 1 1]
[? ? ? ?]
[? ? ? 10].
There are 6 values missing. Where do they come from? What are they? What variable does the first column represent? The second? The third?
Step 4:
Using elementary row operations, we transform M into the matrix M' that looks like
M'= [1 0 0 1]
[0 1 0 2]
[0 0 1 2].
I need to be able to explicity show the computations -- i.e the row of operations - leading from M tp M'.
From this it follows that a=____, b____, and c=___. Thus our polynomial p(x) is p(x)=?
Step 5:
Check the answer by evaluating p(x) with the a, b and c values determined in step 4. We should have p(-1)=1, p(1)=5, and p(2)=10.
Click here to see answer by longjonsilver(2297)

Question 28451: If 2+3i is the root of a quadratic equation with the real coefficients, what is the sum of the roots of an equation?

Click here to see answer by venugopalramana(3286)

Question 28502: 1) Using the quadratic equation 2/3^2+X=1/2, perform the following
Click here to see answer by LilSkittleMd(119)

Question 28502: 1) Using the quadratic equation 2/3^2+X=1/2, perform the following
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28194: what is quadreatic equation?
Click here to see answer by LilSkittleMd(119)

Question 28522: PLEASE HELP ME SOLVE THIS EQUATION. 5X-2Y=-5, Y-5X=3.
THANK YOU SO MUCH. MRS. NEESE.
Click here to see answer by AnlytcPhil(1277)

Question 28519: IF the equation of the parabola is written y=ax²+bx+c, then a must be..
The parabola on this graph is an upside down bowl with its vertex being at 2 on the y axis...
1. zero
2. positive
3. negative
4. none of the above

Click here to see answer by AnlytcPhil(1277)

Question 28541: To Whom it may Concern,
My name is Stephanie A. Thoma and i have been trying to solve the
following equation.
(2x-1) = 1/2
I have tried squaring both sides, as well as the quadriatic equation formula with no success
Click here to see answer by askmemath(368)

Question 28623: How do I do this one?

Click here to see answer by Earlsdon(6287)

Question 28694: For the function y=x^2-6x+8, perform the following tasks:
Put the function in the form y=a(x-h)^2+k
What is the line of symmetry?
Click here to see answer by venugopalramana(3286)

Question 28694: For the function y=x^2-6x+8, perform the following tasks:
Put the function in the form y=a(x-h)^2+k
What is the line of symmetry?
Click here to see answer by josmiceli(9686)

Question 28651: Factor Completely
a^3-4a^2+3a-12
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28715: Find the possible value or values of y in the quadratic equation 4-4y-y^2=0
Click here to see answer by longjonsilver(2297)

Question 28716: Find the possible value or values of r in the quadratic equation r^2-7r-8
Click here to see answer by wuwei96815(245)

Question 28712: Find the value or values of p in the quadratic equation p^2+13p-30=0
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28882: How do you find the coordinates of the vertex?
heres a problem y=3x^2
Click here to see answer by stanbon(57361)

Question 28869: My teacher wrote this on the worksheet : Factor the following Quadratic equations using only the "A" value factors:
30x^2 + 31x + 1
How do I solve it?
Click here to see answer by longjonsilver(2297)

Question 28727: Geometricly prove that:
(x+y)^2 = x^2+2xy+y^2
(x-y)^2 = x^2-2xy+y^2
(x+y)(x-y) = x^2-y^2
Click here to see answer by venugopalramana(3286)

Question 28978: thanks for your help. A garden area is 30 ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400ft^, what is the width of the path?
A=(2)LW
2x30.20=1200
1200-400=800 sq ft left

could the path be 20 ft wide? 20 times 20 times 2=800

Click here to see answer by stanbon(57361)

Question 29077: Could you help me find the x-intercepts of the equation y=-2x^2-8x+20?

Click here to see answer by venugopalramana(3286)

Question 29077: Could you help me find the x-intercepts of the equation y=-2x^2-8x+20?

Click here to see answer by mathtech5(4)

Question 29170: solve by completing the square?
x^2+4x-5=0
Click here to see answer by sdmmadam@yahoo.com(530)

Question 29248: The area of a circle can be shown as:
A=Pi(x^2-20x+100)
Use factoring to find the expression for the radius of a circle.
this equation factors to (x-10)(x-10)
so the expression for the radius of a circle is r=(x-10)
If the are of the circle is 16pi^2ft What is the value for x?
A=pir^2
16pi^2=pi(x-10)^2 and I am back where I started from. Thank you for the help.
Click here to see answer by Earlsdon(6287)

Question 29322: How do find the x and y intercept of 5x-6y= -15, and could you show me step by step?

Click here to see answer by Nate(3500)

Question 29361: How do you expand an equation into general form such as y=2(x+3)^2-8
Click here to see answer by sdmmadam@yahoo.com(530)

Question 29375: Let * be the operation defined by a*b=2b-2a. Find 16*(8*4).
Thanks so much im really confused and i have no idea what to do.
Click here to see answer by stanbon(57361)

Question 29373: Ellen has two more nickels than dimes and three more quarters than nickels. She has $3.35 in all.
Click here to see answer by Bb(19)

Question 29455: if a ball is thrown directly upward with a velocity of 20 feet per second, its heigh (in feet) after t seconds is given by y= 20t - 16t^2. what is the max height attained by the ball?
Click here to see answer by Paul(988)

Question 29577: I can't figure this one out, can you help me.
Find the equation of the quadratic function with a vertex at V(1,3) passing thru the point P(2,1).Write answer in the form y=ax^2 + bx + c.
Thanx for your help!
Click here to see answer by longjonsilver(2297)

Question 29676: COMPLETE THE SQUARE. THEN WRITE THE PERFECT-SQUARE TRINOMIAL IN FACTORED FORM.
X^2 + 18X
Click here to see answer by ikdeep(226)

Question 29691: solve 2 sin square 0-7sin0=-3for0,when0degree<0<-360 degrees
Click here to see answer by longjonsilver(2297)

Question 29638: I need help solving by completing the perfect square to get exact solutions. Based on the solutions I then need to describe the position of the graph of F(x)=on the x-y plane.
Click here to see answer by longjonsilver(2297)

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