1. Problem: Analyze $f(x) = x^{2} + 10x + 24$.
2. Find the vertex:
Use vertex formula $x = -\frac{b}{2a}$ for $a=1$, $b=10$:
$$x = -\frac{10}{2 \times 1} = -5$$
Then find $y$ at $x=-5$:
$$f(-5) = (-5)^2 + 10(-5) + 24 = 25 - 50 + 24 = -1$$
Vertex is $(-5, -1)$.
3. Find the roots:
Solve $x^{2} + 10x + 24 = 0$ by factoring:
$$x^{2} + 6x + 4x + 24 = 0 \Rightarrow (x+6)(x+4) = 0$$
So roots are $x = -6$ and $x = -4$.
4. Axis of symmetry: The vertical line through vertex $x = -5$.
5. Domain: All real numbers $(-\infty, \infty)$ because it is a quadratic.
6. Range: Since parabola opens upwards ($a=1>0$), range is $[-1, \infty)$.
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1. Problem: Analyze $f(x) = x^{2} - 6x + 8$.
2. Find the vertex:
$$x = -\frac{-6}{2 \times 1} = 3$$
Calculate $y$:
$$f(3) = 3^{2} - 6 \times 3 + 8 = 9 - 18 + 8 = -1$$
Vertex is $(3, -1)$.
3. Find the roots:
Factor:
$$x^{2} - 6x + 8 = (x - 2)(x - 4) = 0$$
Roots are $x = 2$ and $x = 4$.
4. Axis of symmetry: $x = 3$.
5. Domain: $(-\infty, \infty)$
6. Range: Since $a=1>0$, range is $[-1, \infty)$.
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Graph shapes: Two parabolas both opening upwards.
- First parabola vertex at $(-5, -1)$ with roots $-6$ and $-4$.
- Second parabola vertex at $(3, -1)$ with roots $2$ and $4$.
They share the same minimum $y$-value $-1$ but occur at different $x$ values.
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Quadratic Properties
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