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Section 1.2 – Finding Limits Graphically and Numerically

Section 1.2 – Finding Limits Graphically and Numerically. f ( x ). L. x. c. Informal Definition of a Limit. If f ( x ) becomes arbitrarily close to a single REAL number L as x approaches c from either side, the limit of f ( x ) , as x appraches c , is L . The limit of f(x)….

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Section 1.2 – Finding Limits Graphically and Numerically

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  1. Section 1.2 – Finding Limits Graphically and Numerically

  2. f(x) L x c Informal Definition of a Limit If f(x) becomes arbitrarily close to a single REAL number L as x approaches c from either side, the limit of f(x), as xapprachesc, is L. The limit of f(x)… is L. Notation: as x approaches c…

  3. Calculating Limits Our book focuses on three ways: • Numerical Approach – Construct a table of values • Graphical Approach – Draw a graph • Analytic Approach – Use Algebra or Calculus This Lesson Next Lesson

  4. Example 1 Use the graph and complete the table to find the limit (if it exists). 6.859 7.88 7.988 8 8.012 8.12 9.261 If the function is continuous at the value of x, the limit is easy to calculate with direct substitution: 23 = 8.

  5. Example 2 Use the graph and complete the table to find the limit (if it exists). Can’t divide by 0 -2.1 -2.01 -2.001 DNE -1.999 -1.99 -1.9 If the function is not continuous at the value of x, a graph and table can be very useful.

  6. Example 3 Use the graph and complete the table to find the limit (if it exists). -6 2.9 2.99 -6 2.999 8 2.999 2.99 2.9 If the function is not continuous at the value of x, the important thing is what the output gets closer to as x approaches the value. The limit does not change if the value at x=-4 changes.

  7. Three Limits that Fail to Exist f(x)approaches a different number from the right side of c than it approaches from the left side.

  8. Three Limits that Fail to Exist f(x)increases or decreases without bound as x approaches c.

  9. Three Limits that Fail to Exist f(x)oscillates between two fixed values as x approaches c. Closest Closer Close

  10. A Limit that DOES Exist If the domain is restricted (not infinite), the limit off(x)exists as x approaches an endpoint of the domain. BAD QUESTION This concept will be addressed more efficiently later in the chapter.

  11. Example Given the function t defined by the graph, find the limits at right.

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