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Let f(x) = 3x – 1 and ε > 0. Find a 8 >0 such that 0 < 1x – 4 < 8 implies |f(x) – 11< . (List the largest such 8.) S = What limit does this prove? lim 3x 1 = 11 XO lim 3x – 1 = 11 X4 lim 3x 1 = 4 X11 lim 4x 1 = 3 X 11 lim 3x 1 = 0 X4

Answer :

The question is about determining a delta value in the epsilon-delta limit definition using the function f(x) = 3x - 1. Based on f(x), as x approaches 4 the value is 11 setting up |f(x) - 11| < ε. After transforming equations, we can conclude that δ = ε/3.

The question seems to involve the epsilon-delta definition of a limit in calculus. Specifically, it appears to be learning about the limit of the function f(x) = 3x - 1 as x approaches 4.

To use the epsilon-delta definition, we wish to find a delta (δ) such that 0 < |x - 4| < δ implies |f(x) - 11| < ε. The value 11 comes from substituting 4 (which is the limit point) into the function, giving us 3(4)-1=11.

To find the exact value of δ, we have to adjust the equation |f(x) - 11| < ε into an equivalent form of 0 < |x - 4| < δ. Doing so, we find that |3x - 12| < ε or 3|x - 4| < ε. Divide through by 3 to find |x - 4| < ε/3, therfore δ = ε/3 would satisfy the condition.

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