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Maths and statistics discussion, revision, exam and homework help. 48 Minutes Ago: 24th October 2011 15:11   Find gradient of curve y=1.5x^3+0.5x^2-4x+2 at: (need some explaination)? Find gradient of curve y=1.5x^3+0.5x^2-4x+2 at:

a) y=0
c) negative root

Can someone please explain how i get the answer

The answers:
a)-1+1/3, 1+1/2, 12 <----- mixed fractions
c) 0

I know for a) we are trying to find the xintercepts or roots, but im not too sure how to factorise the equation D: or however so we tackle the question,

Thank You very much!

Last edited by abdmoh!; 32 Minutes Ago at 15:27. 33 Minutes Ago: 24th October 2011 15:25   Re: Find gradient of curve y=1.5x^3+0.5x^2-4x+2 at: (need some explaination)? Hey,

yeah that's straight from my text book D:. By 'y=0' wouldn't they mean find the roots? Like after you find the derivative?

This stuff is confusing

Thanks

PS: the answers for a) are mixed fractions

15 Minutes Ago: 24th October 2011 15:44   Re: Find gradient of curve y=1.5x^3+0.5x^2-4x+2 at: (need some explaination)? Find gradient of curve y=1.5x^3+0.5x^2-4x+2 at:

a) y=0
c) negative root

Can someone please explain how i get the answer

The answers:
a)-1+1/3, 1+1/2, 12 <----- mixed fractions
c) 0

I know for a) we are trying to find the xintercepts or roots, but im not too sure how to factorise the equation D: or however so we tackle the question,

Thank You very much!

TO find the gradient of a curve at any point, you need to differentiate it, the formula for which is: axn --> naxn-1.

Factorise 1.5x3 + 0.5x2 - 4x + 2 to find out the points at which the curve intersects the x-axis (y = 0 line).

Then, you insert those x co-ordinates into the differentiated expression (sub them in) to find out the gradients at those points.

11 Minutes Ago: 24th October 2011 15:48   Re: Find gradient of curve y=1.5x^3+0.5x^2-4x+2 at: (need some explaination)? Hey thanks man.

Can you help me out with the factorise part: "Factorise 1.5x3 + 0.5x2 - 4x + 2 to find out the points at which the curve intersects the x-axis (y = 0 line)."

Thanks,

6 Minutes Ago: 24th October 2011 15:53   Re: Find gradient of curve y=1.5x^3+0.5x^2-4x+2 at: (need some explaination)? Hey thanks man.

Can you help me out with the factorise part: "Factorise 1.5x3 + 0.5x2 - 4x + 2 to find out the points at which the curve intersects the x-axis (y = 0 line)."

Thanks,

AGAIN

POSTS 2 and 3 .... I have shown you how to do this

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