What is the quotient of (x^3 + 8) divided by (x + 2)?
Check the final answer first, then review the worked steps.
Check the final answer first, then review the worked steps.
3. Apply the sum of cubes formula: In this case, $a = x$ and $b = 2$. Applying the formula, we get:
$$x^3 + 8 = (x+2)(x^2 - x(2) + 2^2)$$
$$x^3 + 8 = (x+2)(x^2 - 2x + 4)$$
4. Perform the division: We need to find the quotient of $(x^3 + 8) \div (x + 2)$. Using the factored form from the previous step:
$$\frac{x^3 + 8}{x + 2} = \frac{(x+2)(x^2 - 2x + 4)}{x + 2}$$
5. Simplify the expression: Cancel out the common factor $(x+2)$ from the numerator and the denominator:
$$\frac{(x+2)(x^2 - 2x + 4)}{x + 2} = x^2 - 2x + 4$$
Alternatively, we can use polynomial long division or synthetic division. Using synthetic division with the root of the divisor $x+2=0$, which is $x=-2$:
-2 | 1 0 0 8
| -2 4 -8
----------------
1 -2 4 0
The resulting coefficients are 1, -2, and 4, which correspond to the polynomial $1x^2 - 2x + 4$. The remainder is 0.