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s344n2d4d5 [400]
3 years ago
15

Brainliest question please help please help me solve all the two problems please

Mathematics
1 answer:
alexgriva [62]3 years ago
4 0

Answer:

(-1,5)

Step-by-step explanation:

up the x corridor and down the y axis.

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Picture thanks a lot
kobusy [5.1K]
2.8 is the correct answer :)
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Lmno is a kite find the length of ln
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3 years ago
Given the function f(x)=3x+5a / x^2-a^2 find the value of a for which f'(12) = 0
maria [59]
The function, as presented here, is ambiguous in terms of what's being deivded by what.  For the sake of example, I will assume that you meant

           3x+5a
<span> f(x)= ------------
</span>          x^2-a^2

You are saying that the derivative of this function is 0 when x=12.  Let's differentiate f(x) with respect to x and then let x = 12:

             (x^2-a^2)(3) -(3x+5a)(2x)
f '(x) = ------------------------------------- = 0 when x = 12
                [x^2-a^2]^2

(144-a^2)(3) - (36+5a)(24)
------------------------------------  =  0
               [   ]^2

Simplifying,

(144-a^2) - 8(36+5a) = 0

144 - a^2 - 288 - 40a = 0

This can be rewritten as a quadratic in standard form:

-a^2 - 40a - 144 = 0, or a^2 + 40a + 144 = 0.

Solve for a by completing the square:

a^2 + 40a + 20^2 - 20^2 + 144 = 0
        (a+20)^2    = 400 - 144 = 156

        Then a+20 = sqrt[6(26)] = sqrt[6(2)(13)] = 4(3)(13)= 2sqrt(39)

         Finally, a = -20 plus or minus 2sqrt(39)

You must check both answers by subst. into the original equation.  Only if the result(s) is(are) true is your solution (value of a) correct.
6 0
3 years ago
A flag pole 20 feet tall casts a shadow 12 feet long. If John is 5 feet tall, what is the length of John's shadow while standing
posledela

His shadow will be 3 feet tall

6 0
3 years ago
Please, can you do this step-by-step.... 2 1/3 + 6 3/5
lina2011 [118]

Answer:

8 14/15

Step-by-step explanation:

Step 1:

2 1/3 + 6 3/5

Step 2:

2 5/15 + 6 9/15

Answer:

8 14/15

Hope This Helps :)

3 0
3 years ago
Read 2 more answers
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