Asked by becky

Multiply

(7-2x^4)^2

Is this right?

36(-2x^4+7)
Answered by DanH
woops. this one, if I'm seeing it right...
you would have (7-2x^4)(7-2x^4), and then you have to use the "FOIL" method...right?
Answered by becky
So, would the answer be

-2x^4+7^2
Answered by DanH
(7-2x^4)(7-2x^4)

first, multiply the first two: 7x7=49
then, multiply the outside two:7 x -2x^4, which is -14x^4.
then, multiply the inside two, which is also -14x^4
then, multiply the last two:
(-2x^4) x (-2x^4) which is 4x^8.

so, we have: 49 -14x^4 -14x^4 + 4x^8.

simplified to 49 -28x^4 + 4x^8.
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