Question: 11.51. Ify = 2 + 3xi + 5x2 - 8x3, (a) ryXi < 0 (b) ryXyXi < 0 ( c ) r yxyXJC2 ^ ^

11.51. Ify = 2 + 3xi + 5x2 - 8x3,

(a) ryXi < 0

(b) ryXyXi < 0

(

c

)

r yxyX\JC2 ^ ^

(d) Insufficient information to answer.

(e) Answers (a), (b), and

(c) are all correct.

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