Consider the Linear Approximation of the function
𝑓
(
𝑥
)
at
𝑥
=
𝑎
.

Which of the following is the best description of what the Linear Approximation does?

Question

Consider the Linear Approximation of the function 
𝑓
(
𝑥
)
 at 
𝑥
=
𝑎
.

Which of the following is the best description of what the Linear Approximation does?

BlackTom AI · Accepted Answer

The question asks for the best description of what the Linear Approximation does at x = a. 
Option 1 states: 'The linear approximation uses a horizontal straight line to approximate square roots close to x = a.' This is misleading because linear approximation relies on a tangent line, not a horizontal line, and it is not focused specifically on square roots; thus this description is incorrect.
Option 2 says: 'The linear approximation uses the tangent line of f(x) at x = a to approximate f(x).' While it mentions the tangent line and the point a, it omits the important caveat that the approximation is most accurate for values of x near a. Without specifying the locality (near a), the statement is incomplete and could be interpreted as universally accurate, which is not precise enough to capture the essence of linear approximation.
Option 3 states: 'The linear approximation uses the tangent line of f(x) at x = a to approximate values of f(x) close to x = a.' This is the precise and standard description: we replace f by its tangent line at a and use that line to estimate f(x) for x values near a, reflecting the local nature of the approximation.
Option 4 says: 'The linear approximation uses the tangent line of f(x) at x = a to approximate values of the derivative f′(x) close to x = a.' This confuses the purpose: the tangent line approximates the function values, not the derivative itself, so this option misstates the goal of the linear approximation.
In summary, the correct conceptual framing is that the tangent line at a serves as a local linear model for f near a, providing estimates of f(x) for x near a, not for far values or for approximating the derivative directly. The third option best captures this precise idea, while the others either mischaracterize the geometry (horizontal line), omit the locality condition, or misstate what is being approximated (the derivative rather than the function values).

MAT135H5_F25_ALL SECTIONS 4.2 Preparation Check

Consider the Linear Approximation of the function 𝑓 ( 𝑥 ) at 𝑥 = 𝑎 . Which of the following is the best description of what the Linear Approximation does?

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