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`E`
`text(By elimination:)`
`text{As} \ \ x to a^+ \ , \ f^{′}(x) to ∞`
`:. \ text{Eliminate}\ A, B, C`
`f(x) \ text{exists for} \ x ∈ (a,∞)`
`f^{′}(x) \ text{only exists for} \ \ x ∈ (a, ∞)`
`:. \ text{Eliminate}\ D`
`=> E`
Part of the graph of `y = f(x)` is shown below.
The corresponding part of the graph of `y = f^{\prime}(x)` is best represented by
A. | B. | ||
C. | D. | ||
E. |
`A`
`text(By Elimination):`
`text(S.P. at)\ \ x = 5`
`=> f^{\prime}(x) = 0\ \ text(when)\ \ x = 0`
`text(Eliminate C, E)`
`text(Gradient is negative when)\ \ x < 5,\ \ text(and positive when)\ \ x >5`
`text(Eliminate B, D)`
`=> A`
`B`
`text(S)text(ince)\ \ f(x)>0\ \ text(for all)\ x,\ text(the)`
`text(antiderivative function has no stationary)`
`text(points.)`
`=>\ text(Only B or E are possibilities.)`
`text(Also, the antiderivative function must have)`
`text(an increasing gradient for all)\ x.`
`=> B`
Part of the graph `y = f(x)` of the polynomial function `f` is shown below
`f prime (x) < 0` for
`C`
The graph of the function `y = f(x)` is shown below.
Which if the following could be the graph of the derivative function `y = f′(x)`?
`=> B`
`text(Stationary points at)\ \ x = – 3, 0`
`:. f′(x)\ \ text(has)\ x text(-intercepts at)\ -3, 0.`
`text(Only)\ B, C or D\ text(possible).`
`text(By inspection of the)\ \ f(x)\ \ text(graph:)`
`f′(x) > 0quadtext(for)quadx < −3`
`text(Only)\ B\ text(satisfies.)`
`=> B`
The diagram shows the graph of a function with domain `R`.