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which is correct? i.e a+b\a-b (after rationallization)a+b\a-b * a+b\a+b or a+b\a-b * a-b\a-b ?

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can it be a-b rather than a+b?

it would be equal but it wouldn't helpful in rationalisation

all right thanks

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one more question
?

may i ask

yes!

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u got?

how will we use power rule in this question?

so the first step would be to remember that the the derivative of a sum , is the sum of derivatives

yes yes

derivative of a constant will be 0

right

so the problem is much simpler now

can you remember the derivative of a function of a function?

to me it's start right now:)

i'm sorry

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\[ (f\circ g)'(x)=f(g(x))'=f'(g(x))g'(x)\]

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you have to multiply by the derivative of the the inside function

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following?

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yeah

but how?

i know this stuff is tricky, can you tell me where about you are having trouble

haha

it is but u have solved it thank u so much!!

yeah but do understand the chain rule/,

no will be tomorow in college

hey did you use chain rule?

the chain rule for the derivative of a function of a function \[(f\circ g)'(x)=g'(x)f'(g(x))\]

is there any other way for this question except chain rule?

u didt use power rule? did u?

i used the power fule to find f '(x) and g'((x)

confusing me

actually i have solved all my questions except this one in quite a simple way

did you get the right answers?

i'm solving questions using theorems

there is no video

yeah answer is right

well you will have to learn the chain rule

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mistake* -2x\ 2 sqrt 1 - x square

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you can cancel the two

yeah rightly said!