Evaluate the limit?

Question

limb→7
1/b−1/7 / b−7

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Answer 1 · 2018-03-17T18:24:37

# -1/49#.

#"The Reqd. Lim="lim_(b to 7){1/b-1/7}/(b-7)#,

#=lim(7-b)/{7b(b-7)}#,

#=lim_(b to 7)-1/(7b)#,

#=-1/(7xx7)#,

#=-1/49#.