Question

can someone PLEASSEE help explain this problem to me? It's multiplying polynomials
(x^4+4) (x^2-4)

Answer 1

Use FOIL

Answer 2

(x^4 * X^2) - (4 *4) +(4x^2)-(4x^4)

Answer 3

= X^6 -4X^4 +4X^2-16

Answer 4

I haven't learned about foil yet but thank you. and thanks @adel_demo . do you think there's anyway you could explain to me the process of how you did that

Answer 5

sure one second

Answer 6

okay thank you!

Answer 7

multiply the outer elements and add them to the inner elements then add them to the multiplication of the first element and the first element then add this to the multiplication of the second element and the second element

Answer 8

and of course dont forget the sign rule
+ * + = +
- * - = +
_ * + = -

Answer 9

thank you so much!!!!!! i have one more question -
(x^2+3x+1) (x^2+x+2)
i got a bunch of different answers but this is the format for me to type in for the answer-
"_ _ + _ _ _ + _ _ _ + _ _ _ _"

Answer 10

@adel_demo

Answer 11

now we have a diffrant type and we need more than 4

Answer 12

take the first element x^2 and multiply it to the (x^2+x+2)

Answer 13

and then take the second element 3x and multiply it to (x^2+x+2)

Answer 14

then take the third element 1 and multiplay it to (x^2+x+2)

Answer 15

then u would have 9 new elements add them to gether u should get a 6 elements only at the end

Answer 16

okay so i did the first element to start and got this- 2x^4+1x^2_2^2
did i do it right?

Answer 17

i didn't mean to start that with a - sign

Answer 18

nope :(

Answer 19

see X^2 * X^2 = X^4
not 2X^4

Answer 20

try again :)

Answer 21

ohh! i forgot to add the powers!
so is it x^4+x^2+2x^2 for the first term?

Answer 22

for the 2nd term is it- 3x^2 + 3x+6

Answer 23

the middle one is powe 3 not 2

Answer 24

it is 3X not three this is ur mistake

Answer 25

i mean the middle element of the first group

Answer 26

ok thanks i understand. this is what i have now
1st term: x^4+x^3+2x^2
2nd term: 3x^3+3x^2+6x
3rd term: 1x^2+1x+2

Answer 27

wow this is wonderful ^_^ now add the ones with the same power together :)

Answer 28

this is what i got but i wasn't sure if i was supposed to add the actual powers together.
x^4+4x^3+6x^2+7x+2

Answer 29

this is soo right :)

Answer 30

omg!! thanks soo much! :)

Answer 31

ur welcome :)