Inequalities Parabolas
1. We are asked to find solutions to inequalities by graphing three parabolas and analyzing their vertices and tables of values.
2. For the first inequality: $y > (x-5)^2 + 2$
- The vertex is at $(5, 2)$.
- The parabola opens upward since the coefficient of the squared term $(x-5)^2$ is positive.
- Values near the vertex: For $x=4$, $y=(4-5)^2+2=1+2=3$; for $x=6$, $y=(6-5)^2+2=1+2=3$.
- So, points near vertex are $(4,3)$ and $(6,3)$.
- The solution region is above the parabola since $y >$ the parabola.
3. For the second inequality: $y \leq 2(x+1)^2 - 4$
- The vertex is at $(-1, -4)$.
- The parabola opens upward and is vertically stretched by factor 2.
- Calculate nearby points: for $x=0$, $y=2(0+1)^2 - 4 = 2(1) - 4 = -2$; for $x=-2$, $y=2(-2+1)^2 - 4 = 2(1)^2 - 4 = -2$.
- Points near vertex: $(0,-2)$ and $(-2,-2)$.
- The solution region is on or below the parabola since $y \leq$ the parabola.
4. For the third inequality: $y \geq x^2 + 8x + 25$
- Complete the square: $x^2 + 8x + 25 = (x^2 + 8x + 16) + 9 = (x+4)^2 + 9$
- Vertex is at $(-4, 9)$.
- Parabola opens upward.
- Calculate values: for $x=-3$, $y=(-3+4)^2+9=1+9=10$; for $x=-5$, $y=(-5+4)^2+9=1+9=10$.
- Nearby points: $(-3,10)$ and $(-5,10)$.
- Solution region is on or above the parabola since $y \geq$ the parabola.
5. Summary:
- Inequality 1: vertex $(5,2)$, solutions where $y > (x-5)^2 + 2$, i.e., points above parabola.
- Inequality 2: vertex $(-1,-4)$, solutions where $y \leq 2(x+1)^2 - 4$, points on or below parabola.
- Inequality 3: vertex $(-4,9)$, solutions where $y \geq (x+4)^2 + 9$, points on or above parabola.
These vertices and values provide key reference points to graph and identify solution regions.