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YS Lim
YS Lim

Form5 chevron_right Addmaths chevron_right Malaysia

Stucked at the evaluate part !!! Helppp

Date Posted: 4 years ago
Views: 411
J
J
4 years ago
Quite simple actually. Just realise the following :

8x /( 7√(x-1) )

= 8/7 ( 1/√(x-1) )

= 3/2 × 16/21 × ( 1/√(x-1) )

= 16/21 × ( 3x / (2√(x-1)) )


(How to get 16/21 :

8/7 ÷ 3/2 = 8/7 x 2/3 = 16/21

So 16/21 x 3/2 = 8/7 )
J
J
4 years ago
So,


(upper limit 5, lower limit 2) ∫ 8x/( 7√(x-1) ) dx

= (upper limit 5, lower limit 2) ∫ 16/21 ( 3x / (2√(x-1)) ) dx

= 16/21 (upper limit 5, lower limit 2) ∫ 3x / (2√(x-1)) ) dx

= 16/21 [√(x - 1) (x + 2) ] (upper limit 5, lower limit 2)


Easy t continue from here
YS Lim
YS Lim
4 years ago
Thankiewwww

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Lim En Jie
Lim En Jie's answer
73 answers (Tutor Details)
1st
Trick for these questions is to multiply by whatever fraction is required and it’s inverse fraction.
Lim En Jie
Lim En Jie
4 years ago
And it’s reciprocal fraction** my bad.
YS Lim
YS Lim
4 years ago
Tq so much