Find the first three terms of the product in acending powers.
(1-2x^2-x^4)(4+x^2-2x^4)
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OpenStudy (anonymous):
well, why don't you multiply the two polynomials and post what you got?
OpenStudy (toxicsugar22):
ok
OpenStudy (toxicsugar22):
i got 4-x^2-2x^4-8x^4x^6-4x^4-x^6-2x^8
is that right and if it isnt caould you please correct me
OpenStudy (anonymous):
okay so you got that. why don't you add up the like terms and post it here.
for example, -2x^4 - 4x^4 = -6x^4
OpenStudy (anonymous):
there should be a plus of minus sign between 8x^4 and x^6 in the polynomial you posted
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OpenStudy (toxicsugar22):
so my answer is not right
OpenStudy (toxicsugar22):
ohh i see there is a minus between 8x^4 and x^6
OpenStudy (toxicsugar22):
4-x^2-2x^4-8x^4-x^6-4x^4-x^6-2x^8
OpenStudy (anonymous):
okay, but you have to add up the like terms.
you see, a^2 +3 a^2 = 4a^2.
similarly
-2x^4 - 8x^4 = -10x^4
OpenStudy (anonymous):
and so on. so group all the terms together and write down your expression
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OpenStudy (toxicsugar22):
i dont know but i got 4-x^2-14x^4-2x^6-2x^8
OpenStudy (toxicsugar22):
is that right
OpenStudy (anonymous):
yes, that seems to be right. all you have to do now is see what the first three terms are in ascending order of powers.
OpenStudy (toxicsugar22):
is it 4-x^2-14x^4
OpenStudy (anonymous):
yes.
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OpenStudy (toxicsugar22):
ok thanks you
OpenStudy (toxicsugar22):
cana you help me with on more promblem
OpenStudy (anonymous):
although you should say, the first three terms are
4, -x^2 and -14x^4
OpenStudy (anonymous):
you are welcome. post your other problem and we will see how to solve it.
OpenStudy (toxicsugar22):
A large wooden box is 3 feet longer than it is wide, and its height is 2 feet shorter than its width.
a. If the width of the box is w, write expressions for its lenghth and its height.
b. write a plynomial for the volume of the box.
c. Write a polynomial for the surface area of the box
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OpenStudy (toxicsugar22):
do u get it
or no
OpenStudy (toxicsugar22):
ok srry not that one
OpenStudy (anonymous):
yes, i got it. do you want the answer or not?
OpenStudy (toxicsugar22):
yes
OpenStudy (toxicsugar22):
thanks
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OpenStudy (anonymous):
okay it says the box is 3 feet longer than its width.
so length = ?
OpenStudy (toxicsugar22):
i dont know can u show me the firt time please
OpenStudy (toxicsugar22):
can u help me please
OpenStudy (anonymous):
if width is w, length = w + 3feet.
OpenStudy (anonymous):
so if height is 2 feet less than width,
height = ?
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OpenStudy (toxicsugar22):
2-w
OpenStudy (toxicsugar22):
or w-2
OpenStudy (anonymous):
yes, w -2 is correct.
so width is w, length is w+3 and height is w-2
OpenStudy (anonymous):
what is the volume and surface area then?
OpenStudy (toxicsugar22):
im not sure
surface area is( w-2)(w+3)
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