Critical Thinking / Discussion / Writing

127.
1. $a x^{2} + b x + c = 0$ $a x^{2} + b x + c = 0$
2. $y = c$ $y = c$
3. $b^{2} - 4 a c < 0$ $b^{2} - 4 a c < 0$
4. Not possible
129.
1. 9
2. 8
131. $(- \infty, 8)$ $(- \infty, 8)$
133. $(- \infty, 0) \cup (0, \infty)$ $(- \infty, 0) \cup (0, \infty)$
135. $3, \sqrt{3}, 2$ $3, \sqrt{3}, 2$
137. $- 5, 1, \frac{2}{5}$ $- 5, 1, \frac{2}{5}$
139. $f (- x) = 3 - 2 x^{2}, g (- x) = \sqrt{- x + 3},$ $f (- x) = 3 - 2 x^{2}, g (- x) = \sqrt{- x + 3},$ and $h (- x) = \frac{2}{x^{2} + 1}$ $h (- x) = \frac{2}{x^{2} + 1}$

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