Questions on Algebra: Polynomials, rational expressions and equations answered by real tutors!

Tutors Answer Your Questions about Polynomials-and-rational-expressions (FREE)

Question 214653: How do I solve by addition method?
x+4y=6
x-y=1
Click here to see answer by Alan3354(69443)

Question 214649: How do I solve by additition method?
2x+7y=5
3x-5y=23
Click here to see answer by Alan3354(69443)

Question 214682: Could you checking to see if I have a right answer? Thank you!
Add simplify by collecting like radical terms if possible, assuming the expression represent nonnegative numbers.
Sqrt(7a)+6sqrt(63a^3)
Sqrt(7a)+6sqrt(9*7*a^2*a)
Sqrt(7a)+6*3sqrt(7a)
=(1+18a)Sqrt(7a)

Click here to see answer by nerdybill(7384)

Question 214675: I am pushing in as a teacher aide the problem is the school has jumped me by about 2 yrs in my math...I just don't remember...Here is the problem
-2x^2+8x+20=0
Click here to see answer by nerdybill(7384)

Question 214677: please help me solve this questionfind all numbers for which the rational expression is undefined 8/w-1
Click here to see answer by jim_thompson5910(35256)

Question 214722: Can someone plese help me with this math problem
Perform the indicated operation completely 5x+5/5x+9 + 5x+13/5x+9

Click here to see answer by stanbon(75887)

Question 214784: Hello, I need help with simplifying this rational expression:
x^2-100 over (x+10)^2
Click here to see answer by drj(1380)

Question 214784: Hello, I need help with simplifying this rational expression:
x^2-100 over (x+10)^2
Click here to see answer by stanbon(75887)

Question 214789: could you checking and see if my answer is right?
Thank you!
Multiply.
(3Sqrt(6)-9Sqrt(5)) (5Sqrt(6)+15Sqrt(5))
15(6)^2-45Sqrt(30)+45Sqrt(30)-135*5
90-0-675
=-585

Click here to see answer by jsmallt9(3758)

Question 214840: Please try your best to explain your steps...THANK YOU!!!
A class had lunch, and the bill totalled $239.25. 4 students had their birthday, therefore, they didn't need to pay. The other students had to pay $1 more than if all the students had paid. How many students had lunch?
Thank you for your time! :) Answer is 33 students.
Click here to see answer by Alan3354(69443)

Question 214839: Hey, I am stuck on this question, and really need help...please help me!
Jaime bought a case of concert T-shirts for $450.She kept two for herself and sold the rest for $560 making a profit of $10 on each T-shirt. How many shirts were in the case?
THank you very much, I appreciate it.
Click here to see answer by rfer(16322)

Question 214127: (3/(2z+1))-(z/(z-2))=((-3z^2+2z=58)/(2z^2-3z-2))
Click here to see answer by jsmallt9(3758)

Question 214837: Thanks for the help in advance.. I need to know some steps :P
Stuart agrees to a house-painting job for $900. He takes 4 days longer than expected,and he has earned $18.75 less per day than expected. In how many days did he expect to complete the house? Answer is 12 days.
Click here to see answer by checkley77(12844)

Question 214918: Multiple Representations with Measurement
Here is what my worksheet looks like:

Symbolic
please help me solve:[[[P=4n]]]

Click here to see answer by jim_thompson5910(35256)

Question 214983: I need help with sloving quadractic equations by factoring:

Click here to see answer by jim_thompson5910(35256)

Question 214993: assume x can represent any real number. Use absolute value notation when necessry.
sqrtx^2-18x+81
I got sqrt(x-9)^2 is this correct?
Click here to see answer by jim_thompson5910(35256)

Question 214993: assume x can represent any real number. Use absolute value notation when necessry.
sqrtx^2-18x+81
I got sqrt(x-9)^2 is this correct?
Click here to see answer by drj(1380)

Question 215001: 3(x-6)^2+x^2=x(x+72)-48x
Click here to see answer by jim_thompson5910(35256)

Question 215001: 3(x-6)^2+x^2=x(x+72)-48x
Click here to see answer by drj(1380)

Question 215063: Completly factor the polynominal -2x-6y-12
I dont even know where to start on this one.. so I dont have any work to show :(
Click here to see answer by jim_thompson5910(35256)

Question 215063: Completly factor the polynominal -2x-6y-12
I dont even know where to start on this one.. so I dont have any work to show :(
Click here to see answer by stanbon(75887)

Question 215064: Completly factor the polynominal h^4+2h^3-8h^2
I dont even know where to start on this one.. so I dont have any work to show :(
Click here to see answer by jim_thompson5910(35256)

Question 215108: How do I reduce this to simplest terms? 7m/2m+14 . 3m+21/9m

I tried dividing by m in the first part of the equation and wasn't sure if i should use the m as the greatest common factor like m(7) over m( 2+14) is that right at all? I did the same thing on the other part of the equation dividing by 3m getting 3m(1+21) over 3m(3). Can you tell me if I am on the right track, and how to correctly solve this equation?
Click here to see answer by jim_thompson5910(35256)

Question 215192: Completely factor the polynomial -2x^2 � 6y � 12.
Click here to see answer by stanbon(75887)

Question 215192: Completely factor the polynomial -2x^2 � 6y � 12.
Click here to see answer by drj(1380)

Question 215191: Completely factor the polynomial -2x2 � 6y � 12.
Click here to see answer by drj(1380)

Question 215191: Completely factor the polynomial -2x2 � 6y � 12.
Click here to see answer by RAY100(1637)

Question 215204: subtract the polynomials using the horizontal format.
5x^3+x^2+4 from 8x^3-x-6
Click here to see answer by drj(1380)

Question 215205: subtract the polynomials using the vertical format.
5x^2+x+2 from 9x^2-x-7
Click here to see answer by drj(1380)

Question 215206: perform the operations as described.
subtract the sum of -8n^2-9n-2 and -3n^2+n+4 from -13n^2-n+9
Click here to see answer by drj(1380)

Question 215249: how do I Factor xy + xz + wy +wz
Click here to see answer by stanbon(75887)

Question 215252: How do I Multiply, simplify, and write in descending order: (t + 4)(t + 1)(2t -2)
Click here to see answer by drj(1380)

Question 215253: how do I Multiply, simplify, and write in descending order: (t + 4)(t + 1)(2t -2)
Click here to see answer by drj(1380)

Question 215253: how do I Multiply, simplify, and write in descending order: (t + 4)(t + 1)(2t -2)
Click here to see answer by RAY100(1637)

Question 215251: how do I Factor x^4 + 5x^3 � 84x^2
Click here to see answer by vleith(2983)

Question 215251: how do I Factor x^4 + 5x^3 � 84x^2
Click here to see answer by drj(1380)

Question 215256: 6. Factor: x^4 + 5x^3 � 84x^2
Click here to see answer by drj(1380)

Question 215258: 4. Multiply, simplify, and write in descending order: (t + 4)(t + 1)(2t -2)
Click here to see answer by drj(1380)

Question 215257: 5. Factor: xy + xz + wy +wz
Click here to see answer by RAY100(1637)

Question 215259: 3. Graph on a plane: 3x � 6y < 18

Click here to see answer by drj(1380)

Question 215260: 3. Graph on a plane: 3x � 6y < 18
Click here to see answer by drj(1380)

Question 215250: how do I Factor x4 + 5x3 � 84x2
Click here to see answer by drj(1380)

Question 215261: 2. Let f(x) = | 7 � 3x |. Find all x for which f(x) > or = 10
Click here to see answer by RAY100(1637)

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