1. **State the problem:** We need to divide the cubic polynomial $$2x^3 + 2$$ by the binomial $$2x + 2$$ and express the quotient in the form $$Ax^2 + Bx + C$$.
2. **Recall the division formula:** When dividing polynomials, $$\frac{P(x)}{D(x)} = Q(x) + \frac{R(x)}{D(x)}$$ where $$Q(x)$$ is the quotient and $$R(x)$$ is the remainder. Here, since the divisor is degree 1 and dividend degree 3, the quotient will be degree 2.
3. **Set up the division:**
$$\frac{2x^3 + 0x^2 + 0x + 2}{2x + 2} = Ax^2 + Bx + C$$
4. **Multiply both sides by the divisor:**
$$2x^3 + 2 = (2x + 2)(Ax^2 + Bx + C)$$
5. **Expand the right side:**
$$= 2x \cdot Ax^2 + 2x \cdot Bx + 2x \cdot C + 2 \cdot Ax^2 + 2 \cdot Bx + 2 \cdot C$$
$$= 2A x^3 + 2B x^2 + 2C x + 2A x^2 + 2B x + 2C$$
6. **Group like terms:**
$$= 2A x^3 + (2B + 2A) x^2 + (2C + 2B) x + 2C$$
7. **Match coefficients with the left side:**
Left side: $$2x^3 + 0x^2 + 0x + 2$$
Right side: $$2A x^3 + (2B + 2A) x^2 + (2C + 2B) x + 2C$$
Equate coefficients:
- For $$x^3$$: $$2 = 2A \implies A = 1$$
- For $$x^2$$: $$0 = 2B + 2A = 2B + 2(1) = 2B + 2 \implies 2B = -2 \implies B = -1$$
- For $$x$$: $$0 = 2C + 2B = 2C + 2(-1) = 2C - 2 \implies 2C = 2 \implies C = 1$$
- For constant term: $$2 = 2C = 2(1) = 2$$ (checks out)
8. **Final answer:**
$$A = 1, B = -1, C = 1$$
Thus, the quotient is $$x^2 - x + 1$$.
Cubic Division
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