smiley2015
Simplify the following expression: (5x2 + 3x + 4) − (2x2 + 5x − 1). If the final answer is written in the form Ax2 + Bx + C, what is the value of A? The 2 be hide 5x is squared and so is the one by 2x
Delete
Share
This Question is Closed
ryan123345
Best Response
You've already chosen the best response.
0
Distribute the negative
smiley2015
Best Response
You've already chosen the best response.
1
So -1?
jazy
Best Response
You've already chosen the best response.
1
I have terrible drawing skills, sorry.
Claudilovely
Best Response
You've already chosen the best response.
0
|dw:1363207136675:dw|
smiley2015
Best Response
You've already chosen the best response.
1
So 3x - 5 - 5x + 1
jazy
Best Response
You've already chosen the best response.
1
I meant:|dw:1363207208912:dw|
jazy
Best Response
You've already chosen the best response.
1
Very close. What is -1 times 1?
smiley2015
Best Response
You've already chosen the best response.
1
-1
jazy
Best Response
You've already chosen the best response.
1
Right! So your equation would be 3x - 5 - 5x - 1. Can you combine the like terms?
smiley2015
Best Response
You've already chosen the best response.
1
Yes. the x
jazy
Best Response
You've already chosen the best response.
1
Lets rearrange it so its easier to work with. Remember to keep the symbol in front of each term.
3x - 5x - 5 - 1
First off, what is 3x - 5x?
smiley2015
Best Response
You've already chosen the best response.
1
2x
GiGIgo3
Best Response
You've already chosen the best response.
0
-2x-6
jazy
Best Response
You've already chosen the best response.
1
Close, it would be a negative 2.
jazy
Best Response
You've already chosen the best response.
1
@GiGIgo3 please do not post direct answers. (:
smiley2015
Best Response
You've already chosen the best response.
1
Ok
jazy
Best Response
You've already chosen the best response.
1
So now we have:
-2x - 5 - 1
-5 - 1 = ?
smiley2015
Best Response
You've already chosen the best response.
1
6
jazy
Best Response
You've already chosen the best response.
1
Negative 6. (:
So our expression is: -2x - 6
smiley2015
Best Response
You've already chosen the best response.
1
Ok. Thanks!
jazy
Best Response
You've already chosen the best response.
1
You're welcome! Oh and:\[\Huge \mathcal{\text{Welcome To OpenStudy} ☺}\]
smiley2015
Best Response
You've already chosen the best response.
1
Thanks! can you help me some more
jazy
Best Response
You've already chosen the best response.
1
Sure thing!
smiley2015
Best Response
You've already chosen the best response.
1
Simplify the following expression: (5x2 + 3x + 4) − (2x2 + 5x − 1). If the final answer is written in the form Ax2 + Bx + C, what is the value of A?
smiley2015
Best Response
You've already chosen the best response.
1
The 2 be hide 5x is squared and so is the one by 2x
jazy
Best Response
You've already chosen the best response.
1
\[(5x^2 + 3x + 4) - (2x^2 + 5x - 1)\]We have to distribute the -1.
\[(-1)\stackrel{\Huge\curvearrowright}(2x^2 + 5x - 1)\]-1 * 2x^1 = -2x^2
-1 * 5x = -5x
-1 * -1 = 1
Now we have:
\[5x^2 + 3x + 4 - 2x^2 - 5x + 1\]Combine like terms.
5x^2 - 2x^2 = 3x^2
3x - 5x = -2x
4 + 1 = 5
And we end up with:
\[\large 3x^2 - 2x + 5\]
jazy
Best Response
You've already chosen the best response.
1
\[\large Ax^2 + Bx + C\]
\[\large 3x^2 - 2x + 5 \]
So what is A?
smiley2015
Best Response
You've already chosen the best response.
1
3x2
jazy
Best Response
You've already chosen the best response.
1
Just the 3. (:
smiley2015
Best Response
You've already chosen the best response.
1
Thanks! I have some more if that is ok?
jazy
Best Response
You've already chosen the best response.
1
I've gtg right now, sorry. :/ Maybe @hartnn or @Luis_Rivera can continue to help you. I hope I helped!
smiley2015
Best Response
You've already chosen the best response.
1
You did thanks!
hartnn
Best Response
You've already chosen the best response.
0
one suggestion though,
make new post for new question.
so that many others can help you too :)
smiley2015
Best Response
You've already chosen the best response.
1
How do I do that?
hartnn
Best Response
You've already chosen the best response.
0
you can 'close' this question .
smiley2015
Best Response
You've already chosen the best response.
1
Ok. Thanks
hartnn
Best Response
You've already chosen the best response.
0
good ! :) welcome ^_^