1. **Problem statement:** Sketch the graph of the quadratic function $$y = - (x-1)(x+6)$$.
2. **Formula and rules:** This is a quadratic function in factored form. The x-intercepts are found by setting $$y=0$$ and solving for $$x$$.
3. **Find x-intercepts:**
$$0 = - (x-1)(x+6)$$
Removing the negative sign for solving zeros:
$$0 = (x-1)(x+6)$$
Set each factor to zero:
$$x-1=0 \Rightarrow x=1$$
$$x+6=0 \Rightarrow x=-6$$
So, the x-intercepts are at points $$(1,0)$$ and $$(-6,0)$$.
4. **Find y-intercept:**
Set $$x=0$$:
$$y = - (0-1)(0+6) = - (-1)(6) = 6$$
So, the y-intercept is at $$(0,6)$$.
5. **Find turning point (vertex):**
The vertex lies midway between the x-intercepts:
$$x = \frac{1 + (-6)}{2} = \frac{-5}{2} = -2.5$$
Calculate $$y$$ at $$x=-2.5$$:
$$y = - (-2.5 - 1)(-2.5 + 6) = - (-3.5)(3.5) = - (-12.25) = 12.25$$
So, the turning point is at $$(-2.5, 12.25)$$.
6. **Graph features:**
- The parabola opens downward (due to the negative sign).
- It crosses the x-axis at $$(1,0)$$ and $$(-6,0)$$.
- It crosses the y-axis at $$(0,6)$$.
- The vertex is a maximum point at $$(-2.5, 12.25)$$.
Final answer: The graph of $$y = - (x-1)(x+6)$$ has x-intercepts at $$(1,0)$$ and $$(-6,0)$$, y-intercept at $$(0,6)$$, and a maximum turning point at $$(-2.5, 12.25)$$.
Quadratic Graph Bd5452
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