## anonymous 5 years ago Find a polynomial for the perimeter and for the area. There is a box with d+2 on top and on the right side there is a d. Need the perimeter, and the area.

1. anonymous

so lets say a,b,c are the sides than a=b=d+2 and c=d+2?

2. anonymous

i wrote d+2 twice :)

3. anonymous

the box has area a*b*c

4. anonymous

and perimeter: 2ab+2ac+2bc

5. anonymous

I honestly don't know how to do it this is what the question was.

6. anonymous

thank you

7. anonymous

hey can I ask you something?

8. anonymous

you have to put d+2 instead of a,b and d instead of c

9. anonymous

so area will be (d+2)^2*d=d^3+4d^2+4d

10. anonymous

perimeter is 2(d+2)(d+2) +4d(d+2)

11. anonymous

if I understood the question correctly, the phrasing is pretty bad

12. anonymous

Is that after simplifing the answer?

13. anonymous

which one?

14. anonymous

both the perimeter and the area have to be simpfly not factor.

15. anonymous

2(d+2)(d+2) +4d(d+2)=2d^2+8d+8+4d^2+8d=6d^2+16d+8

16. anonymous

thank you can you do my other sample i have too?

17. anonymous

can you do it? I guess this is some kind of homework :-) I can help but I wont solve it for you.

18. anonymous

$\sqrt[20]{(-9)^{20}}$

19. anonymous

ok. sounds good to me.

20. anonymous

is that 30sqrt(-9)^20 ? not really visible

21. anonymous

20sqrt(-9)^20

22. anonymous

oh ok!

23. anonymous

what is ur guess?

24. anonymous

6.088

25. anonymous

how did you get that? :)

26. anonymous

i times -9 20 times and then i divied it by 20

27. anonymous

oh I see, but here this is not multiplication or division

28. anonymous

what does 2^4 mean?

29. anonymous

the 4 is the root of 2?

30. anonymous

would be 8

31. anonymous

nope, 2 to the power of 4 means that you take 2*2*2*2 (4times)=16

32. anonymous

so (-9)^20=-9*-9*-9..... (20 times)

33. anonymous

now what does $\sqrt{?}$ mean?

34. anonymous

it is the inverse operation so lets say $\sqrt[3]{8}$

35. anonymous

that means the number that you multiply by itself 3 times and you will get 8

36. anonymous

when you multiply -9 20 times you don't get a good answer

37. anonymous

you get a horrid number, really big one

38. anonymous

but now we have 20sqrt(-9)^20

39. anonymous

what is the number that you multiply by itself 20 times to get (-9)^20?

40. anonymous

(-9)^20 means -9 multiplied by itself 20 times

41. anonymous

i know what i get when u multiply -9. 20 times. u get 282042115992

42. anonymous

43. anonymous

no used my phone.

44. anonymous

you do not need the exact value to solve the problem

45. anonymous

the answer is: what is the number that you multiply by itself 20 times to get (-9)^20? (-9)^20 means -9 multiplied by itself 20 times it is -9

46. anonymous

but that is not the good answer as the correct one is 9 can you see why?

47. anonymous

by the way, I suggest not using calculator for studying maths, unless there is some horrid calculation.