Help I need help answering a couple questions

[Helpurgent]

For the 3 that are equations I need to know all factors like (x+_) and for the shape ones i need to know the length. Thanks

 

[Helpurgent]

I need help with this one too

 

[Dr.Peterson]

Please follow our submission guidelines:

Posting Guidelines (Summary)

Welcome to our tutoring boards! :) This page summarizes the main points from our posting guidelines. As our name implies, we provide math help (primarily to students with homework). We do not generally post immediate answers or step-by-step solutions. We don't do your homework. We prefer to...

www.freemathhelp.com

In particular, give one problem per thread (or a couple closely related ones), and show work so we can see where you need help. Also, for multiple choice problems, the choices are part of the problem, because there may be valid answers that are not among the choices. Don't omit them.

 

[docr.sg]

Hi, I have solved your first question.
You can view the solution here:

 

[HallsofIvy]

Do you know how to factor numbers? The second one (since you say you have already done the first) is \(\displaystyle x^2- 38x- 80\). To "factor" a trinomial means to find integers, a and b, so that the trinomial is equal to the product \(\displaystyle (x- a)(x+ b)= x^2- x+ bx- ab= x^2- (a- b)- ab\) (I have used the same negative signs as in the given polynomial). So how does 80 factor? Since 80 is an even number, "2" is a factor- the easiest way to factor 80 is 2 times 40 and it just happens that 40- 2= 38! So this factors as (x- 2)(x+ 40).

For the "rectangle" problem, I presume you know, from elementary geometry, that "area equal length times width". Here, you are told that the area is given by \(\displaystyle x^2+ 16x- 36\) and that the width is x- 2. So the length must be some number "a" such that \(\displaystyle (x+ a)(x- 2)= x^2+ 16x- 36\) (I know it must be "-a" rather than "+a" because (+a)(-2) will be negative as is -36. In fact since -2a must equal -36, a must equal -36/-2. So what is a?

 

[Steven G]

I wonder if Helpurgent and docr.sg are the same person??

 

[Deleted member 4993]

I wonder if Helpurgent and docr.sg are the same person??

Probably not - one has static IP address from Singapore - the other has static IP address from NY.

 

[Steven G]

Probably not - one has static IP address from Singapore - the other has static IP address from NY.

Thanks for looking into this. It just seems suspicious.

 

[HallsofIvy]

I suspect that docr.sg is just shilling another website!

 

[docr.sg]

Hi Helpurgent

The detailed explanation for your question can be found here: