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## Question

secondary 4 | A Maths

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How to do this one？

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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