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## #1 2018-12-06 10:46:51

Malubia
Member
Registered: 2018-12-06
Posts: 3

### Problem in calculus. Please help!!!!

Sir how  you derived this formula "x = ta + (1−t)b" in
https://www.mathsisfun.com/calculus/concave-up-down-convex.html
Please explain me this formula.I didn't get it

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## #2 2018-12-06 20:43:31

bob bundy
Administrator
Registered: 2010-06-20
Posts: 8,452

### Re: Problem in calculus. Please help!!!!

hi Malubia

Welcome to the forum.

That had me puzzled for a while.

Draw a horizontal line  AB across from point   A = ( a, f(a) ) to  B = ( b, f(a) ) with a point X = (x , f(a) ) anywhere between A and B.

Define t to be the fraction XB/AB.

Then

Hope that helps,

Bob

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob Bundy

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## #3 2018-12-06 21:41:38

Malubia
Member
Registered: 2018-12-06
Posts: 3

### Re: Problem in calculus. Please help!!!!

@bob bundy
Thank you bob. May you live for thousand years

Last edited by Malubia (2018-12-06 21:42:40)

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