Factor completely x8 − 81.

(x4 − 9)(x4 + 9)
(x2 − 3)(x2 + 3)(x4 − 9)
(x2 − 3)(x2 + 3)(x4 + 9)
(x2 − 3)(x2 − 3)(x4 − 9)

Option C, (x2 − 3)(x2 + 3)(x4 + 9)

Step-by-step explanation:

x^8 - 81 factors as (x^4 - 9)(x^4 + 9)

(x^4 - 9)(x^4 + 9) factors as (x^2 - 3)(x^2 + 3)(x^4 + 9)

 Option C, (x2 − 3)(x2 + 3)(x4 + 9)

14

step-by-step explanation:

3. (5x + 1) - (-10x + 6)

simplify the answer choice. combine like terms. remember to distribute the negative to the terms inside the second parenthesis. also remember that two negatives = one positive, and one of each sign = negative.

- (-10x + 6) = + 10x - 6

simplify. combine like terms:

5x + 1 + 10x - 6

5x + 10x + 1 - 6

15x - 5

∴ it is your answer

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