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3.7 NOTES Graphing Quadratic Inequalities
BELLWORK: Graph the system of linear inequalities.
y < 2x ‑ 3
y ≤ ‑ x + 7
LESSON 3.7 - Graphing Quadratic Inequalities
• Today we will be graphing QUADRATIC INEQUALITIES.
• These are a combination of what weʹve done so far this chapter (graphing parabolas) PLUS what we did last chapter (graphing lines and shading on one side).
HOW TO GRAPH QUADRATIC INEQUALITIESSTEP 1: Graph the parabolas like you normally would
• Use a solid curve for ≤ and ≥
• Use a dotted curve for < and >
STEP 2: Plug the point (0, 0) into the original inequality to see if it gives you a true statement.
• If it does give you a true statement, shade where (0, 0) is
• If it gives you a false statement, shade where (0, 0) is not
NOTE: If the parabola passes through the point (0, 0), then you must pick a different point to plug in.
STEP 3: The solution is the area that you shade. If you are graphing a SYSTEM of quadratic inequalities, then the solution is where the shaded areas of each parabola overlap.
Graph the quadratic inequality.
y ≥ (x + 3)2 ‑ 2
Graph the quadratic inequality.
y > ‑ (x ‑ 6)(x + 2)
3.7 NOTES Graphing Quadratic Inequalities
Graph the quadratic inequality.
y > 3x2 ‑ 6x ‑ 5
Graph the quadratic inequality.
y ≥ ‑ x2
Graph the system of quadratic inequalities.
y ≥ 2(x + 5)2 ‑ 7
y < ‑ x2 ‑ 2x + 5
Graph the system of quadratic inequalities.
y > 4x2 ‑ 40x + 91
y ≤ (x ‑ 5)2 ‑ 1
Graph the system of quadratic inequalities.
y > 2(x + 3)2 ‑ 4
y ≤ ‑(x ‑ 4)(x ‑ 8)
no solution
Graph the system of quadratic inequalities.
y ≤ ‑ (x ‑ 3)(x ‑ 7)
y < ‑ (x + 2)2 + 3
3.7 NOTES Graphing Quadratic Inequalities
HOMEWORK:3.7 Worksheet ‑ Graphing Quadratic Inequalities