Question

Find the first three terms of the product in acending powers.

(1-2x^2-x^4)(4+x^2-2x^4)

Answer 1

well, why don't you multiply the two polynomials and post what you got?

Answer 2

ok

Answer 3

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

Answer 4

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

Answer 5

there should be a plus of minus sign between 8x^4 and x^6 in the polynomial you posted

Answer 6

so my answer is not right

Answer 7

ohh i see there is a minus between 8x^4 and x^6

Answer 8

4-x^2-2x^4-8x^4-x^6-4x^4-x^6-2x^8

Answer 9

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

Answer 10

and so on. so group all the terms together and write down your expression

Answer 11

i dont know but i got 4-x^2-14x^4-2x^6-2x^8

Answer 12

is that right

Answer 13

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.

Answer 14

is it 4-x^2-14x^4

Answer 15

yes.

Answer 16

ok thanks you

Answer 17

cana you help me with on more promblem

Answer 18

although you should say, the first three terms are
4, -x^2 and -14x^4

Answer 19

you are welcome. post your other problem and we will see how to solve it.

Answer 20

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

Answer 21

do u get it
or no

Answer 22

ok srry not that one

Answer 23

yes, i got it. do you want the answer or not?

Answer 24

yes

Answer 25

thanks

Answer 26

okay it says the box is 3 feet longer than its width.
so length = ?

Answer 27

i dont know can u show me the firt time please

Answer 28

can u help me please

Answer 29

if width is w, length = w + 3feet.

Answer 30

so if height is 2 feet less than width,
height = ?

Answer 31

2-w

Answer 32

or w-2

Answer 33

yes, w -2 is correct.
so width is w, length is w+3 and height is w-2

Answer 34

what is the volume and surface area then?

Answer 35

im not sure

surface area is( w-2)(w+3)

Answer 36

can u help me

Answer 37

what is the volume of a cuboid?

Answer 38

just tell me the general formula.

Answer 39

ok
the surface formula

Answer 40

http://www.gcsemathstutor.com/images/shapespace/ss-vol-cuboid.jpg

Answer 41

http://www.mathsteacher.com.au/year10/ch14_measurement/14_cuboid/20cuboid.htm

Answer 42

s=2lh+2wh+2lw

Answer 43

is that it

Answer 44

yes. so express the surface area in terms of the height width and length of your cube.

Answer 45

so do i plug in the 3 and 2 for the height and the width

Answer 46

your height is w -2
and length is w+3
and width is w.
so plug those values.

Answer 47

so s=2(w+3)(w-2)+2(w)(w-2)+2(w+3)(w)

Answer 48

is it right

Answer 49

yes

Answer 50

now do i distrubuite

Answer 51

yes, you can do that

Answer 52

how do i muliply 2(w+3)(w-2)

Answer 53

can you just show me

Answer 54

http://www.webmath.com/polymult.html

Answer 55

ok i got 6w^2+4w-12
is that right

Answer 56

is it right

Answer 57

no

Answer 58

than can u help me

Answer 59

please

Answer 60

i gave you the link, did you use it?

Answer 61

yes ill do it again

Answer 62

okay.

Answer 63

igot the same thing

Answer 64

unless im doing something wrong

Answer 65

r u there

Answer 66

yes, \[2(w+3)(w-2)=2(w \times w +3 \times w -2 \times w -2 \times 3)\]

Answer 67

\[= 2(w ^{2}+w-6)=2w ^{2}+2w-12\]

Answer 68

is that it

Answer 69

is that the anwer to that question

Answer 70

no, that is the multiplication of 2(w+3)(w-2)
the surface area is 2 lw+2lh+2hw
and the volume is lwh

Answer 71

ok can u help me step by step please

Answer 72

im so lost

Answer 73

can u help

Answer 74

what do you need help with? I already explained everything to you.

Answer 75

no answering the suface area

Answer 76

please like how do u solve 2(w+3)(w-2)+2(w)(w-2)+2(w+3)(w)

Answer 77

2w(w-2) = 2w^2-4w
2w(w+3) = 2w^2+6w.
2(w+3)(w-2) = 2w^2 +2w-12
add all three and post what you get.

Answer 78

6w^4w-12 is that right

Answer 79

is it

Answer 80

please help me

Answer 81

r u there

Answer 82

yes that is right. that is the surface area.

Answer 83

ok and the volume of the box

Answer 84

the surface area of the the box is 6w^6+4w-12

Answer 85

how did you get 6w^6 term in there?

Answer 86

i dk

Answer 87

can you add the three terms like I said and post it here properly?

Answer 88

i did

Answer 89

2w(w-2) = 2w^2-4w
2w(w+3) = 2w^2+6w.
2(w+3)(w-2) = 2w^2 +2w-12
add all three and post what you get

Answer 90

that is what i got but i can doit again

Answer 91

so how did you get a w^6 term there if you added them properly?

Answer 92

2w^2-4w
2w^2+6w.
2w^2 +2w-1=6w^6+4w-12

Answer 93

okay, you added 2w^2+2w^2+2w^2 and got 6w^6?

Answer 94

can u help me please

Answer 95

you added -4w+6w+2w and got 4w correct?

Answer 96

then how did you add 2w^2+2w^2+2w^2 and get 6w^6?
according to your logic, -4w+6w+2w should be 4w^3 isn't it?

Answer 97

ohh yes so can u write the answer again please

Answer 98

no, I can't.
I don't think you understood what I am trying to say to you.
if you add 2 oranges to 2 oranges, how many oranges do you get?