Circle Graph
1. **Problem statement:** Graph the circle given by the equation $$(x + 1)^2 + y^2 = 81$$.
2. **Identify the center and radius:** This is the equation of a circle in standard form $$(x - h)^2 + (y - k)^2 = r^2$$ where the center is $$(h,k)$$ and the radius is $$r$$.
3. From the equation, we see:
- Center $$= (-1, 0)$$ (because $x + 1 = x - (-1)$)
- Radius $$r = \sqrt{81} = 9$$
4. **Graph description:**
- The circle is centered at $$(-1, 0)$$
- It intersects the x-axis where $$y = 0$$:
$$ (x+1)^2 = 81 \implies x+1 = \pm 9 \implies x = -10 \text{ or } 8 $$
- It intersects the y-axis where $$x = 0$$:
$$ (0+1)^2 + y^2 = 81 \implies 1 + y^2 = 81 \implies y^2 = 80 \implies y = \pm \sqrt{80} \approx \pm 8.944 $$
5. The circle can therefore be drawn on a coordinate plane with the x-axis and y-axis ranging approximately from $$-10$$ to $$9$$ and $$-9$$ to $$9$$ respectively, centered at $$(-1,0)$$ with radius $$9$$.
6. **Final answer:** The graph represents a circle centered at $$(-1,0)$$ with radius $$9$$, matching the equation $$(x + 1)^2 + y^2 = 81$$.