The initial quadratic can be either positive or negative so we must solve for both possibilities.
Solving for positive:
3x^2 - 19x + 20 < 2x + 2 = 3x^2 - 21x + 18 < 0
= x^2 - 7x + 6 < 0
= (x - 6)(x - 1) < 0
Therefore, Critical Values where x crosses the x-axis are x = 1 or x = 6. And since we are solving for < 0, we focus on the graph under the x-axis, resulting in 1 < x < 6.
Solving for negative:
-3x^2 + 19x - 20 < 2x + 2 = 3x^2 - 17x + 22 > 0
= (3x - 11)(x - 2) > 0
Therefore, Critical Values where x crosses the x-axis are x = 2 or x = 11/3. And since we are solving for > 0, we focus on the graph above the x-axis, resulting in x < 2 or x > 11/3.
We must then find the values for x which satisfies both positive and negative, and using a simple numberline we find 1 < x < 2 or 11/3 < x < 6 as our final answers.
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