Expression 7: "m" equals left parenthesis, StartFraction, "f" left parenthesis, "b" , right parenthesis minus "f" left parenthesis, "a" , right parenthesis Over "b" minus "a" , EndFraction , right parenthesism=fb−fab−a
equals=
0.40.4
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What happens if you set "b = a"?
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This is why we need to take the limit as b approaches a. Otherwise, we would get a slope of 0/0.
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Visuals (Don't mess with this.)
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left parenthesis, 2 , negative 2.2 , right parenthesis2,−2.2
left parenthesis, 8 , 0.2 , right parenthesis8,0.2