Here is the definition of infinite right-hand limit.

Modify the definition to cover the following cases.

a. lim_x→cƒ(x) = ∞

b. lim_x→c+ ƒ(x) = -∞

c. lim_x→c-ƒ(x) = -∞

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We say that f(x) approaches infinity as x approaches c from the right, and write lim f(x) = ∞, x-c+ if, for every positive real number B, there exists a correspond- ing number 8 >0 such that for all x c B.