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Mathematics
OpenStudy (anonymous):

8. The area of a rectangular painting is given by the trinomial x2 + 4x – 21. What are the possible dimensions of the painting? Use factoring. (1 point)

Parth (parthkohli):

Do you know factoring of quadratic expressions?

OpenStudy (anonymous):

no. i don't know any of this. honestly. aha.

Parth (parthkohli):

Oopsie...

Parth (parthkohli):

@Callisto can you continue?

OpenStudy (anonymous):

?

OpenStudy (lgbasallote):

you quit fast enough @ParthKohli :P

Parth (parthkohli):

lgba has a tutorial btw

OpenStudy (anonymous):

ok. so i'm assuming you don't know? lololololol.

Parth (parthkohli):

I do know.. it's a long explanation. Do you want me to teach it to you?

OpenStudy (callisto):

Area = length times width. Since you're given the area, you need to factorise the expression given for the area. Am I on the right track @ParthKohli ?

Parth (parthkohli):

Exactly :D

OpenStudy (anonymous):

no. sorry. but when people explain me things over the computer i don't really understand. i'm not smart at all. aha, i'm just trying to pass this final cause i have a 62% and i can't fail the final or i fail the grade.

Parth (parthkohli):

lgba....link your tutorial please

OpenStudy (callisto):

@ParthKohli I agree :|

OpenStudy (lgbasallote):

hmm we can try...

OpenStudy (anonymous):

i'm confused?

Parth (parthkohli):

http://www.youtube.com/watch?v=nOZTe8jU2g4 Here you go

OpenStudy (anonymous):

its not working?

OpenStudy (lgbasallote):

lol just teach her parth :p

OpenStudy (anonymous):

9. The area of a rectangular barnyard is given by the trinomial 12x2 + 14x – 40. What are the possible dimensions of the barnyard? Use factoring. (1 point) – 4x + 10 and –3x + 4 is that right?

OpenStudy (lgbasallote):

close...but no

OpenStudy (lgbasallote):

if you multiply that you'll get \[12x^2 - 16x - 30x + 40\]

OpenStudy (anonymous):

4x – 10 and 3x + 4

Parth (parthkohli):

A very very long explanation....I'll get tired.

OpenStudy (lgbasallote):

....is this multiple choice?

OpenStudy (anonymous):

yeeah.

OpenStudy (lgbasallote):

lol clever ;D

OpenStudy (anonymous):

is that the correct answer?

OpenStudy (lgbasallote):

i encourage you to solve it though

OpenStudy (lgbasallote):

and no it isnt....i shall shush now...

OpenStudy (anonymous):

well i don't get it.. so i don't know.

Parth (parthkohli):

Let me explain it in a nutshell. You must split the middle term so that in the expression \(ax^2 + bx + c\), we have the sum of the two split co-effecients as b. Also, the split co-efficients must have a product as the product of a and c.

OpenStudy (lgbasallote):

this is a bad technique...but do trial and error on your multiple choice :p

Parth (parthkohli):

Lol this is the only way to factor :P

OpenStudy (lgbasallote):

<---does trial and error

OpenStudy (anonymous):

..do you want to know how to do it? or just know the answer?

Parth (parthkohli):

You can multiply in all the choices and see if the product is same as the trinomial.

OpenStudy (callisto):

Sorry.. I'm not in the mood of writing today :(

OpenStudy (anonymous):

the answer.

Parth (parthkohli):

Not allowed to give the answer.

OpenStudy (anonymous):

ok.

OpenStudy (lgbasallote):

do you know how to multiply binomials?

Parth (parthkohli):

\(\Large \color{Black}{\Rightarrow x^2 + 4x + 21 = x^2 + 7x - 3x + 21 }\) Enough of hints.

OpenStudy (anonymous):

(x+7)*(x-3) factor the equation and solutions are easily visable as 7 and 3

Parth (parthkohli):

*facepalm* @timo86m

OpenStudy (anonymous):

I am asking

OpenStudy (anonymous):

whats your question @timo86m

OpenStudy (anonymous):

would 7 and 3 be the answer it will be actually -7 and 3 but I think they are absolute values.

OpenStudy (anonymous):

just message me @timo86m

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