Question

Which is equal to (x + 4)(3x2 4x + 2)?
(Points : 1)
3x^3 - 16x^2 - 14x + 8

3x^2 - 4x + 8

3x^2 3x + 6

3x^3 4x^2 + 2x + 8

Answer 1

x (3x^2 - 4x + 2) + 4 = (3x^3 - 4x^2 + 2x) + 4
4 (3x^2 - 4x + 2) = (12x^2 - 16x + 8)

Answer 2

together: (3x^3 - 4x^2 + 2x) + (12x^2 - 16x + 8)

3x^3 - 4x^2 + 12x^2 + 2x - 16x + 8

3x^3 - 16x^2 -14x + 8 (this should be the answer)

Answer 3

it was just to much to put down to simplify it by grouping lol

Answer 4

otherwise it would look like this:
(+3x^3) (-) (- 4x^2) (+) (+12x^2) (+) (+2x) (-) (-16x) (+) (+8) that is what my teacher did not show us

Answer 5

\[(x+4)(3x^{2}-4x + 2)\]
\[= x(3x^{2} -4x + 2) + 4(3x^{2} -4x + 2)\]
\[= (3x^{3} - 4x^{2} + 2x) + (12x^{2} - 16x + 8)\]
Redistributing.
\[= 3x^{3} + 8 x^{2} - 14 x + 8\]

Answer 6

i dont have that choice though

Answer 7

That's odd. It's the correct answer. :/

Answer 8

http://www.wolframalpha.com/input/?i=+%28x+%2B+4%29%283x2+-4x+%2B+2%29

Check the first alternate form.

Answer 9

i know how they groped it, they did it the same way you did but how i did mine idont know either

Answer 10

this is algebra2 i think

Answer 11

are they in order from greatest to least?

Answer 12

Yes.

Answer 13

oh
it is : (x + 4)(-3x2 - 4x + 2)

so: -3x^3 - oh dang
this is all wrong

Answer 14

(x + 4)(-3x2 - 4x + 2)

1. x ( -3x^2 - 4x + 2) + 4 ( -3x^2 - 4x + 2)

2. (-3x^3 -4x^2 + 2x) + (-12x^2 - 16x + 8)

3. -3x^3 - 4x^2 -12x^2 + 2x - 16x + 8

4. -3x^3 - 16x^2 -14x + 8

Answer 15

its correct