A jewelry box has a volume of x3 + 7x2 + 7x – 15 cm3 and the height is x + 3 cm. Find the polynomial that would represent the area of the bottom of the jewelry box? Explain your reasoning(please).

Question

anonymous · Answer

hmm

anonymous · Answer

tis a tough 1

anonymous · Answer

x^3 + 7x^2 + 7x = 15 

  Or  
 x^3 + 7x^2 + 7x - 15

anonymous · Answer

would you multiply x^3 + 7x^2 + 7x - 15 by x+3?

anonymous · Answer

i think you worded it wrong maybe?

anonymous · Answer

(x+5)*(x-1)*(x+3)

anonymous · Answer

sorry i was having trouble factoring it :)

anonymous · Answer

$$ x^3 + 7x^2 + 7x - 15 =x^3+3x^2+4x^2+12x-5x-15\=x^2(x+3)+4x(x+3)-5(x+3)=(x+3)(x^2+4x-5)$$

anonymous · Answer

(x+5)*(x-1)   is your answer Since    x+3 is your height

anonymous · Answer

Volume=area of bot*height
$$(x+3)(x^2+4x−5)=(x+3)*area \ of \ bott$$

anonymous · Answer

how did u factor it?

anonymous · Answer

ooh also you could have done algebraic long division  

using x+3 as denominator.

anonymous · Answer

thats right

anonymous · Answer

you dont factor you   divide 

use algebraice long division  :)

anonymous · Answer

x^2+4x^2-5x

anonymous · Answer

If you expand the answer yes :)

anonymous · Answer

yeyaaaaa ty!

anonymous · Answer

wait!

anonymous · Answer

-___-

anonymous · Answer

x^2+4x-5   :)

anonymous · Answer

not 
x^2+4x^2-5x

anonymous · Answer

oi ty SORRY

anonymous · Answer

De nada :) see i teaching you spanish also. De nada is you are welcome :D

anonymous · Answer

haha i know X) gracias mis amigos

anonymous · Answer

Good job :D

anonymous · Answer

goodness haha well i must go goodnight! http://www.youtube.com/watch?v=cZO9tMetxno