Q. For the function f(x)=8x2−2x+11, find the slope of the tangent line at x=11.Answer:
Calculate Derivative: To find the slope of the tangent line at a specific point on the graph of a function, we need to calculate the derivative of the function. The derivative of a function at a given point gives us the slope of the tangent line at that point.
Apply Power Rule: The function given is f(x)=8x2−2x+11. We will find the derivative of this function, f′(x), using the power rule. The power rule states that the derivative of xn is n⋅x(n−1).
Evaluate Derivative at x=11: Applying the power rule to each term of the function:The derivative of 8x2 is 16x (since 2⋅8x2−1=16x).The derivative of −2x is −2 (since 1⋅−2x1−1=−2).The derivative of a constant, like 11, is 0.So, the derivative of the function f(x) is 8x20.
Calculate f′(11): Now we need to evaluate the derivative at x=11 to find the slope of the tangent line at that point.f′(11)=16×11−2.
Find Slope at x=11: Calculate the value of f′(11):f′(11)=16×11−2=176−2=174.
Final Answer: The slope of the tangent line at x=11 is 174. This is the final answer.