Por que necesitamos los modelos Matemáticos
2 answers:
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Answer:
2/5
Step-by-step explanation:
Hi! Whenever you find a limit, you first directly substitute x = 5 in.
Hm, looks like we got 0/0 after directly substitution. 0/0 is one of indeterminate form so we have to use another method to evaluate the limit since direct substitution does not work.
For a polynomial or fractional function, to evaluate a limit with another method if direct substitution does not work, you can do by using factorization method. Simply factor the expression of both denominator and numerator then cancel the same expression.
From x²-6x+5, you can factor as (x-5)(x-1) because -5-1 = -6 which is middle term and (-5)(-1) = 5 which is the last term.
From x²-25, you can factor as (x+5)(x-5) via differences of two squares.
After factoring the expressions, we get a new Limit.
We can cancel x-5.
Then directly substitute x = 5 in.
Therefore, the limit value is 2/5.
L’Hopital Method
I wouldn’t recommend using this method since it’s <em>too easy</em> but only if you know the differentiation. You can use this method with a limit that’s evaluated to indeterminate form. Most people use this method when the limit method is too long or hard such as Trigonometric limits or Transcendental function limits.
The method is basically to differentiate both denominator and numerator, do not confuse this with quotient rules.
So from the given function:
Differentiate numerator and denominator, apply power rules.
<u>Differential</u> (Power Rules)
<u>Differentiation</u> (Property of Addition/Subtraction)
Hence from the expressions,
<u>Differential</u> (Constant)
Therefore,
Now we can substitute x = 5 in.
Thus, the limit value is 2/5 same as the first method.
Notes:
- If you still get an indeterminate form 0/0 as example after using l’hopital rules, you have to differentiate until you don’t get indeterminate form.
Answer:
4.11 miles.
Step-by-step explanation:
In the image that I am going to attach we can see the description of the statement in a graph, now, the right triangle is formed, and we can apply Pythagoras, and the hypotenuse would be equal to:
(5 ^ 2 + x ^ 2) ^ (1/2)
The speed is equal to:
V = d / t, therefore the time is t = d / V, the total time would then be:
total time = (5 ^ 2 + x ^ 2) ^ (1/2) / 3 + (7-x) / 6
we derive with respect to x, and we are left with:
dt / dx = x / (3 * (5 ^ 2 + x ^ 2) ^ (1/2)) - 1/6 = 0
x / (3 * (5 ^ 2 + x ^ 2) ^ (1/2)) = 1/6
6x / (3 = (5 ^ 2 + x ^ 2) ^ (1/2)
(2 * x) ^ 2 = (5 ^ 2 + x ^ 2)
4 * x ^ 2 = 25 + x ^ 2
3 * x ^ 2 = 25
x ^ 2 = 25/3
x = 2.88
now we replace
7 - x = 7 - 2.89 = 4.11
In other words, the answer is 4.11 miles.
