## KG777 2 years ago Ok so this is so confusing The volume of water in a rectangular swimming pool can be modeled by the polynomial 2x3 − 9x2 + 7x + 6. If the depth of the pool is given by the polynomial 2x + 1, what polynomials express the length and width of the pool? Why couldn't they just give me the volume?

1. geoffb

Can you factor the polynomial? I bet one of the factors will be 2x+1. What are the other two?

2. petewe

they did give you the volume

3. jbovey

lol @petewe

4. KG777

If I was to graph it into a calculator would it show the numbers as roots touching the x axis at 0?

5. petewe

divide 2x3 − 9x2 + 7x + 6 by 2x + 1 and you'll be given a quadratic. factor it to find the other 2 dimensions

6. KG777

bingo x-3, x-2

7. petewe

you're allowed to use graphing calculators on tests?

8. KG777

yes

9. KG777

thanks you guys

10. petewe

not sure if srs

11. geoffb

Why bother learning how to do it when there's OpenStudy and the TI-83, hey @petewe?

12. petewe

are you american?

13. geoffb

Me?

14. petewe

no, KG777

15. petewe

it just amazes me how lenient the american education system is sometimes

16. geoffb

I'm in Canada, and it doesn't seem to be much better here. I took grade 12 math and calculus years ago now, but even then there were graphing calculators. I'm pretty sure they were allowed to be used on the finals. I was the only kid in the class without one (couldn't afford it), but I did the best in my class on the final. Knowing the fundamentals of how to do things is so important, and you're right—it seems it is being lost.