1. **State the problem:** Solve the equation $$4 \{2 - [3(c + 1) - (c + 1)7]^2\} = -2c$$ for $c$.
2. **Simplify inside the brackets:**
Calculate $3(c + 1) - (c + 1)7$.
3. Factor out $(c + 1)$:
$$3(c + 1) - 7(c + 1) = (c + 1)(3 - 7) = (c + 1)(-4) = -4(c + 1)$$
4. Substitute back:
$$4 \{2 - [-4(c + 1)]^2\} = -2c$$
5. Square the term inside the braces:
$$[-4(c + 1)]^2 = 16(c + 1)^2$$
6. So the equation becomes:
$$4 \{2 - 16(c + 1)^2\} = -2c$$
7. Distribute 4:
$$8 - 64(c + 1)^2 = -2c$$
8. Rearrange to isolate terms:
$$8 + 2c = 64(c + 1)^2$$
9. Expand $(c + 1)^2$:
$$8 + 2c = 64(c^2 + 2c + 1)$$
10. Distribute 64:
$$8 + 2c = 64c^2 + 128c + 64$$
11. Bring all terms to one side:
$$0 = 64c^2 + 128c + 64 - 2c - 8$$
12. Simplify:
$$0 = 64c^2 + 126c + 56$$
13. Divide entire equation by 2 to simplify:
$$0 = \cancel{2}64c^2/\cancel{2} + \cancel{2}126c/\cancel{2} + \cancel{2}56/\cancel{2}$$
$$0 = 32c^2 + 63c + 28$$
14. Solve quadratic equation $32c^2 + 63c + 28 = 0$ using quadratic formula:
$$c = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$$
where $a=32$, $b=63$, $c=28$.
15. Calculate discriminant:
$$\Delta = 63^2 - 4 \times 32 \times 28 = 3969 - 3584 = 385$$
16. Calculate roots:
$$c = \frac{-63 \pm \sqrt{385}}{64}$$
**Final answer:**
$$c = \frac{-63 + \sqrt{385}}{64} \quad \text{or} \quad c = \frac{-63 - \sqrt{385}}{64}$$
Solve Quadratic Bc5392
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