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.

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- anonymous

- jamiebookeater

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- anonymous

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

- anonymous

i wrote d+2 twice :)

- anonymous

the box has area a*b*c

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- anonymous

and perimeter: 2ab+2ac+2bc

- anonymous

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

- anonymous

thank you

- anonymous

hey can I ask you something?

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

Is that after simplifing the answer?

- anonymous

which one?

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

ok. sounds good to me.

- anonymous

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

- anonymous

20sqrt(-9)^20

- anonymous

oh ok!

- anonymous

what is ur guess?

- anonymous

6.088

- anonymous

how did you get that? :)

- anonymous

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

- anonymous

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

- anonymous

what does 2^4 mean?

- anonymous

the 4 is the root of 2?

- anonymous

would be 8

- anonymous

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

- anonymous

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

- anonymous

now what does \[\sqrt{?}\] mean?

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

you get a horrid number, really big one

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

I guess you counted that in your head :-)

- anonymous

no used my phone.

- anonymous

you do not need the exact value to solve the problem

- 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

- anonymous

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

- anonymous

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

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