Advertisements
Advertisements
प्रश्न
Find the left and right limits of f(x) = `(x^2 - 4)/((x^2 + 4x+ 4)(x + 3))` at x = – 2
Advertisements
उत्तर
f(x) = `(x^2 - 4)/((x^2 + 4x+ 4)(x + 3))` at x = – 2
f(x) = `((x + 2)(x - 2))/((x + 2)^2 (x + 3))`
f(x) = `(x - 2)/((x +2)(x +3))`
o find the let imit of f(x) at x = – 2
Put x = – 2 – h
Where h > 0
When x → – 2
We have h → 0
`lim_(x -> - 2^-) f(x) = lim_("h" -> 0) ((-2 - "h")- 2)/((-2 "h" + 2)(- 2 - "h" + 3)`
= `lim_("h" -> 0) (-4 - "h")/((- "h")(1 - "h"))`
=`lim_("h" -> 0) 1/"h" ((4 + "h")/(1 - "h"))`
= `1/0 ((4 + 0)/(1 - 0))`
= `oo`
`lim_(x -> - 2^-) f(x) = oo`
o find the right limit of f(x) at x = – 2
Put x = – 2 + h
Where h > 0
When x → – 2
We have h → 0
`lim_(x -> - 2) f(x) = lim_("h" -> 0) ((-2 + "h") - 2)/((-2 + "h" + 2)(-2 + "h" + 3))`
= `lim_("h" -> 0) (-4 + "h")/("h"(1 + "h"))`
= `lim_("h" -> 0) 1/"h"(("h" - 4)/(1 +"h"))`
= `1/0 ((0 - 4)/(1 + 0))`
= `- oo`
`lim_(x -> - 2^-) f(x) = - oo`
APPEARS IN
संबंधित प्रश्न
Evaluate the following limit:
`lim_(y -> -3) [(y^5 + 243)/(y^3 + 27)]`
Evaluate the following limit :
`lim_(x -> 7) [(x^3 - 343)/(sqrt(x) - sqrt(7))]`
In exercise problems 7 – 15, use the graph to find the limits (if it exists). If the limit does not exist, explain why?
`lim_(x -> 3) (4 - x)`
In exercise problems 7 – 15, use the graph to find the limits (if it exists). If the limit does not exist, explain why?
`lim_(x -> 0) sec x`
Sketch the graph of f, then identify the values of x0 for which `lim_(x -> x_0)` f(x) exists.
f(x) = `{{:(x^2",", x ≤ 2),(8 - 2x",", 2 < x < 4),(4",", x ≥ 4):}`
Verify the existence of `lim_(x -> 1) f(x)`, where `f(x) = {{:((|x - 1|)/(x - 1)",", "for" x ≠ 1),(0",", "for" x = 1):}`
Evaluate the following limits:
`lim_(x -> 0) (sqrt(1 + x) - 1)/x`
An important problem in fishery science is to estimate the number of fish presently spawning in streams and use this information to predict the number of mature fish or “recruits” that will return to the rivers during the reproductive period. If S is the number of spawners and R the number of recruits, “Beverton-Holt spawner recruit function” is R(S) = `"S"/((alpha"S" + beta)` where `alpha` and `beta` are positive constants. Show that this function predicts approximately constant recruitment when the number of spawners is sufficiently large
Evaluate the following limits:
`lim_(x -> 0) (sin^3(x/2))/x^2`
Evaluate the following limits:
`lim_(x -> 0) (tan 2x)/(sin 5x)`
Evaluate the following limits:
`lim_(x -> 0) (2 "arc"sinx)/(3x)`
Evaluate the following limits:
`lim_(x -> 0) (2^x - 3^x)/x`
Evaluate the following limits:
`lim_(x - oo){x[log(x + "a") - log(x)]}`
Evaluate the following limits:
`lim_(x -> pi) (1 + sinx)^(2"cosec"x)`
Evaluate the following limits:
`lim_(x -> oo) ((x^2 - 2x + 1)/(x^2 -4x + 2))^x`
Evaluate the following limits:
`lim_(x -> 0) ("e"^("a"x) - "e"^("b"x))/x`
Choose the correct alternative:
`lim_(x - pi/2) (2x - pi)/cos x`
Choose the correct alternative:
`lim_(x -> 3) [x]` =
If f(x) is differentiable at x = 1 and `lim_(h → 0) 1/h f(1 + h) = 5`, then f' (1) is equal to ______.
