Question

Help
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Answer 1

take derivitive first :D

Answer 2

brb :)

Answer 3

okay tell me when your back

Answer 4

First of all for solving this question do you know the conception of : Derivatives.

and i know you can then definitely can solve the question on your own

Answer 5

take dervitive first of all : can you do that?

Answer 6

I dont remember reading anything about derivatives in the text book

Answer 7

how about differentials?

Answer 8

A little. I remember seeing it. Didnt go into much detail

Answer 9

you weren't paying much attention lol :P

Answer 10

Can you tell me. or send me a link about them. either one is fine. :)

Answer 11

anyhoo first we must take the derivative aka differential.
x^2+5*x
luckily this one is one of the most basic and using the rules aka formulas.

http://myhandbook.info/form_diff.html

look at constant rule, sum rule and power rule :D try it out if you can

Answer 12

also the factor rule :)

Answer 13

which factor rul

Answer 14

what do i plug in for d?

Answer 15

and d/dx just means the derivative operator
so

d/dx(x^2+5*x)
means derivitve of x^2+5*x with respect to x

d/dx(x^2)+ d/dx(5*x)
the sum rule this makes it more easy :) seperated into 2 small derivatives instead of one big one. we handle it as 2 seperate problems

d/dx(x^2)= 2x
by the power rule simply decrease the exponent by 1 and multiply the variable and coefficient by the exponent you just decrased. you get 2 :).

d/dx(5*x) = 5
by factor rule

now you plug back in because you did them seperately

2x+5 and that is derivative :) with me so far?

Answer 16

yes

Answer 17

2x+5 is also a tangent function which gives the slope of the tangent at any given x. For example at x=0 the slope is 5.

they want it at 4 tho. So plug it in
2(4)+5=8+5=13

That is your answer :)

Answer 18

no

Answer 19

But i saw where I messed up!

Answer 20

its fixed

Answer 21

was i right tho :)

Answer 22

Thank you so much!

Answer 23

weird tho if you not familiar with calc 1 concepts then it is weird problem to do.

Answer 24

Im not in Calc 1 lol

Answer 25

precalc?

Answer 26

yes

Answer 27

hmm maybe if we do:
x1 = 3
x2 = 5
y1 = 9+15 = 24
y2 = 25+25 = 50

M = (y2-y1)/(x2-x1) = (50-24)/(5-3) = 26/2=13

Answer 28

Voila, the answer given to us by calculus matches up:
f'(4) = 2x+5 = 2*4+5=13

Answer 29

aaa :) calc way is easier tho.

Answer 30

:)

Answer 31

Thank you both!

Answer 32

Im going through all the qustions I missed so i can understand them better

Answer 33

good for you :D