Critical Thinking / Discussion / Writing
127.
ax2+bx+c=0
y=c
b2−4ac<0
Not possible
129.
9
8
131. (−∞, 8)
133. (−∞, 0)∪(0, ∞)
135. 3, 3–√, 2
137. −5, 1,25
139. f(−x)=3−2x2, g(−x)=−x+3−−−−−−√, and h(−x)=2x2+1
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