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secondary 4 | A Maths
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Henry Wang
Henry Wang

secondary 4 chevron_right A Maths

How to do this one?

Date Posted: 2 years ago
Views: 139
Muhd Ilman Fahmi
Muhd Ilman Fahmi
2 years ago
You are given the double derivative of the equation:

D2y/dx2 =-5
If you integrate it you will get

Dy/dx = -5x+C

You are given the info at that point p (-1,3),
Gradient =2

So, substituting the info you have:
Dy/dx=2, x=-1

2=-1 (-5)+C
2=5+C
C= -3

So,
Dy/dx = -5x -3

Integrating the equation again you get

Y= -(5x^2)/2 -3x + C

Sub point P, y=3, x= -1

Solve for C, and then you will get the whole equation.

Hope it helped!

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LOI POH WENG
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