SOLUTION: I have this equation and i have tried many a times and continue to get it wrong. It is multiplying polynomials. This is the original equation (2x^2-5x-1)(x^2+x-3) and thi

Algebra.Com
Question 281508: I have this equation and i have tried many
a times and continue to get it wrong.
It is multiplying polynomials.
This is the original equation
(2x^2-5x-1)(x^2+x-3)
and this is what ive tried.
2x^2(x^2)3x^4
2x^2(x)3x^3
2x^2(-3)-6x^2
-5x(x^2)-5x^3
-5x(x)-5x^2
-5x(-3)15x
-1(x^2)-1x^2
-1(x)-1x
-1(-3)3

And this is my answer.
3x^4+3x^3-12x^2+14x-5x^3+3
Found 2 solutions by Mathematicians, JBarnum:
Answer by Mathematicians(84)   (Show Source): You can put this solution on YOUR website!
I see a couple errors when doing this:

You have the right general method in mind, but the multiplication is coming out differently. For example:

You multiply the numbers in front, so and it looks like you have variables down but when you put them together, you get
Going through the rest of the problem:

Which is equal to:

Combining like terms:

That should be your final answer! ^_^
Answer by JBarnum(2146)   (Show Source): You can put this solution on YOUR website!
(2x^2-5x-1)(x^2+x-3)
its easier if u seperate it into 3 multiplication and then add them together
#1)

#2)

#3)

now add the results together by adding like terms

i organize them to make it easier to see what to add
RELATED QUESTIONS

I have tried this so many times and I just cant seem to get it 0.6x+5 <... (answered by ptaylor)
The cost of building a house increases 26 percent every year. If it costs $93,000 to... (answered by mukhopadhyay)
I cannot see the topics, sorry. In my problem you have to use A=pi r^2. Find the area... (answered by rfer)
What is 80% of 60= n? I have tried cross multiplying and gotten one answer and then tried (answered by jim_thompson5910)
I have tried this over 17 times and I still get the wrong answer when I check it. (answered by algebrahouse.com)
I cannot find the answer to this equation: 2x+5=7x-100. I do not know what I am doing... (answered by stanbon)
I need to find the equation of a line through (-5,4) and parallel to -6x+4y=-7 The... (answered by mananth)
A merchant blends tea that sells for $4.10 a pound with tea that sells for $2.10 a pound... (answered by ewatrrr)
I have the following problem: 80-36/2+6-2x5+1=44 I need to insert parentheses and... (answered by addingup,dragon222,MathTherapy)