Thread: Maths Homework.

The height s metres of a mass thrown vertically upward at a time t seconds given by

S=40t-13t2

Show when 25m= 40t - 13t2, 13t2 - 40t + 25 = 0

There is something about what you do to one side you have to do to the other?

What is m?

Originally Posted by Prove It

What is m?

m is metres

Originally Posted by HollieMay2600

Show when 25m= 40t - 13t2, - 13t2 - 40t + 25 = 0

There is something about what you do to one side you have to do to the other?

I suppose that this represents system of two equations :

(1) :

(2) :

(1)+(2) :

hence :

Originally Posted by princeps

I suppose that this represents system of two equations :

(1) :

(2) :

No. This should be which has, by the quadratic formula, solutions
.

(1)+(2) :

hence :

Yes it is clear now , after original post is edited .