Algebra
14 Online
OpenStudy (anonymous):
Help please!!!!!!!
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OpenStudy (anonymous):
Homework 96 the last problem!
OpenStudy (anonymous):
@Mertsj ?
OpenStudy (anonymous):
@bahrom7893
OpenStudy (anonymous):
I really need help like on the quick i have a paper left to do & omg its just really fustrating...
OpenStudy (tkhunny):
Too bad I won't open a "docx".
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OpenStudy (anonymous):
I know...
OpenStudy (mertsj):
16) If the area of a circle is 144 cm^2 and the radius is x+4 , what is the value of x
OpenStudy (mertsj):
That problem?
OpenStudy (anonymous):
No # 13 is the homework 96
OpenStudy (mertsj):
13) 3m^2+30m+75=0
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OpenStudy (mertsj):
Factor out the 3
OpenStudy (anonymous):
No the one with the squared is homework 96 not 95 it says it on the top
OpenStudy (mertsj):
Ok. I'm tired of guessing. How about YOU post YOUR problem.
OpenStudy (anonymous):
|dw:1367983827107:dw|
OpenStudy (anonymous):
What are the dimesions of the rectangle if the area is 100ft^2?
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OpenStudy (anonymous):
Thats the problem.
OpenStudy (mertsj):
It says the area is 100. How do you find area of a rectangle?
OpenStudy (anonymous):
The dimensions though! not how to solve for area i know 10*10 = 100 but that wont make sense.
OpenStudy (mertsj):
How do you find the area of a rectangle?
OpenStudy (anonymous):
Multiplying i know that already.
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OpenStudy (mertsj):
Multiplying what?
OpenStudy (anonymous):
anyways i plug in 25 for (x-15) & 10 for X
OpenStudy (anonymous):
& by width times lenght!
OpenStudy (mertsj):
The correct answer to "how do you find the area of a rectangle?" is "multiply the length by the width":
OpenStudy (mertsj):
What is the length of your rectangle?
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OpenStudy (anonymous):
(x-15) & width is the X
OpenStudy (anonymous):
Or vice versa 0_o
OpenStudy (mertsj):
What do you get when you multiply them?
OpenStudy (anonymous):
x^2-15x
OpenStudy (mertsj):
What does the problem say that is equal to?
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OpenStudy (anonymous):
its says the area of the rectangle is 100ft^2
OpenStudy (mertsj):
Write that equation.
OpenStudy (anonymous):
x^2-15x=100
OpenStudy (mertsj):
Subtract 100 from both sides.
OpenStudy (anonymous):
oh wait then you equal it to 0 so it would be x^2-15x-100=0
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OpenStudy (mertsj):
Factor the left side: think of two numbers. their product is -100. their sum is -15
OpenStudy (anonymous):
20 & 5?
OpenStudy (anonymous):
-20 & 5!
OpenStudy (mertsj):
So what are the factors?
OpenStudy (anonymous):
wait idk if its + or -
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OpenStudy (mertsj):
What is the sum of -20+5?
OpenStudy (anonymous):
-15 okay that makes sense now ^-^ after that do i set them equal to 0 again so it would become 20 & -5?
OpenStudy (mertsj):
Yes. And you would discard the -5. Why?
OpenStudy (anonymous):
because you can never have a negative there? & wait after would i plug in the 20 & just a+5 to the legnt and width?
OpenStudy (mertsj):
|dw:1367984590671:dw|