1. **State the problem:** Expand the cubic polynomial $$f(x) = 2x^3 + 7x^2 + x - 6$$ in powers of $$(x-2)$$.
2. **Recall the binomial expansion formula:** To expand a function around $x=a$, we write it as a polynomial in $(x-a)$:
$$f(x) = c_0 + c_1(x-a) + c_2(x-a)^2 + c_3(x-a)^3 + \cdots$$
where the coefficients $c_n$ can be found by substituting $x = (x-2) + 2$ and expanding.
3. **Rewrite $f(x)$ substituting $x = (x-2) + 2$:**
$$f(x) = 2((x-2)+2)^3 + 7((x-2)+2)^2 + ((x-2)+2) - 6$$
4. **Expand each term:**
- Expand $((x-2)+2)^3$ using binomial expansion:
$$((x-2)+2)^3 = (x-2)^3 + 3 \cdot 2 (x-2)^2 + 3 \cdot 2^2 (x-2) + 2^3 = (x-2)^3 + 6(x-2)^2 + 12(x-2) + 8$$
- Expand $((x-2)+2)^2$:
$$((x-2)+2)^2 = (x-2)^2 + 2 \cdot 2 (x-2) + 2^2 = (x-2)^2 + 4(x-2) + 4$$
5. **Substitute expansions back into $f(x)$:**
$$f(x) = 2[(x-2)^3 + 6(x-2)^2 + 12(x-2) + 8] + 7[(x-2)^2 + 4(x-2) + 4] + (x-2) + 2 - 6$$
6. **Distribute coefficients:**
$$= 2(x-2)^3 + 12(x-2)^2 + 24(x-2) + 16 + 7(x-2)^2 + 28(x-2) + 28 + (x-2) + 2 - 6$$
7. **Group like terms:**
- Cubic term: $$2(x-2)^3$$
- Quadratic terms: $$12(x-2)^2 + 7(x-2)^2 = 19(x-2)^2$$
- Linear terms: $$24(x-2) + 28(x-2) + (x-2) = 53(x-2)$$
- Constants: $$16 + 28 + 2 - 6 = 40$$
8. **Final expanded form:**
$$\boxed{f(x) = 2(x-2)^3 + 19(x-2)^2 + 53(x-2) + 40}$$
This is the polynomial $f(x)$ expanded in powers of $(x-2)$.
Expand Powers 9Fa4Cb
Step-by-step solutions with LaTeX - clean, fast, and student-friendly.