Question

(8x^4 + 4x^2 + x) - (x + 10)(2ax^2 + 1) The expression is simplified to 8x^4 - 6x^3 - 56x^2 - 10.

What is the value of "a" ?

Answer 1

you will have to expand it out and compare coefficients

Answer 2

and how do i do that ?

Answer 3

the textbooks tend to use a method they call "foil"

Answer 4

whats that ?

Answer 5

\[(a+b)(x+y)=ax+ay+bx+by\]

Answer 6

(x + 10)(2ax^2 + 1) let a=x, b=10, x=2ax^2, and y = 1

Answer 7

Im so confused .

Answer 8

its just multiplication ..... you can do it with some practice

Answer 9

okay

Answer 10

(x + 10)(2ax^2 + 1)

give this a shot, and ill see if i can correct any errors along the way

Answer 11

i have no idea whatsoever on how to do that . . .

Answer 12

\[(a+b)(x+y)=ax+ay+bx+by\]

let a=x, b=10, x=2ax^2, and y = 1

replace and multiply

Answer 13

my choice of general variables is prolly bad seeing the it uses as and xs ... but try to see thru that little fauxpaux

Answer 14

(x+10)(2ax^2+1) . . . for the first part ? ? ?

Answer 15

for the first part we would want to start expanding this with that yes

\[(m+n)(p+q)=mp+mq+npx+nq\]let m=x, n=10, p=2ax^2, and q = 1

Answer 16

(x+10)(2ax^2+1) . . .

Answer 17

im not going to be able to do it for you, and i really dont know what your asking when you restate: (x+10)(2ax^2+1)

Answer 18

can you at least show me the steps cause i have no idea how to do this . .

Answer 19

i have shown you the steps. you multiply the first terms together, add that to the product of the first term in one, by the last term in the other, add that to the product of the last term in one by the first term in the other, and add that to the product of the last terms.

which quite frankly is more confusing to write out than it is to read in notation:\[(m+n)(p+q)=mp+mq+np+nq\]

Answer 20

ive got to head out to class, so ill chk back in on this later today to see if there is any progress.

Answer 21

yes .

Answer 22

i wouldnt know ?

Answer 23

?