## madsmckell Group Title word problem!! A parcel of land is 6ft longer than it is wide. Each diagonal from one corner to the opposite corner is 174 ft long. What are the dimensions of the parcel? 11 months ago 11 months ago

1. gypsy1274 Group Title

Draw a picture. That will help you figure out what to do.

2. OpenSessame Group Title

|dw:1377832287651:dw|

thanks but how do I solve it?

4. gypsy1274 Group Title

It is 6 feet longer than it is wide, so you can write an expression for both the length and the width.

okay.... i did that... then what?:)

6. gypsy1274 Group Title

Use the Pythagorean theorem.

7. gypsy1274 Group Title

|dw:1377832617688:dw|

so... (w+6)^2+w^2=174^2??????

9. gypsy1274 Group Title

Exactly.

10. gypsy1274 Group Title

Solve for w.

okay i will tryyyy

12. gypsy1274 Group Title

You can do it! I have faith in you!!

i was trying to solve for w but i got stuck... will someone help me and walk me through it??

14. gypsy1274 Group Title

(w+6)^2+w^2=30276..... w^2+12w+36+w^2=30276......2w^2+12w+36=30267

and now im stuck

i was trying to use the quadratic formula but i wasnt sure what to do and my numbers were wayyyyyy big

18. gypsy1274 Group Title

Great job! Find a calculator, you are going to need it. :-) The quadratic formula is what you will need. I'm still working through it. Before you get to that, get all terms to the left side of the equation and set it equal to 0.

19. gypsy1274 Group Title

The numbers do get big, but you can handle it, with your calculator's help.

when i do the quadratic inside the root is negative so how would i simplify it??? isnt the quadratic formula -b plus or minus the root of b^2-4ac all over 2a

21. gypsy1274 Group Title

It is not negative. You dropped a negative on the floor....look around, I'm sure it is still nearby. :-)

22. gypsy1274 Group Title

One you get all the terms to the left side, the constant term will be negative.

23. gypsy1274 Group Title

I divided the whole equation by 2 to keep the numbers smaller. $$w^2+6w-15120$$

but when you put in -15120 it is negative in the root soo it wont workkk

the answer in the back of the book is 120 by 126

so still not sure how that works when what ever i root comes out to be a decimal

27. gypsy1274 Group Title

The answer in the back of the book is correct. $\dfrac{-b \pm \sqrt{b^2-4ac}}{2a}$ $w^2+6w-15120$ $\dfrac{-6 \pm \sqrt{6^2-4(1)(-15120}}{2(1)}$ remember that a negative times a negative is a positive.