Sorry I just edited my last message to show what I got but I get (x + 1)^2 - (x + 1)^3 when I expand it out
I would keep it factorised to be honest, looks neater but it really does not matter. All the question now wants is for you to find the y-intercept so there is no particular best way to write your answer.
for part c, when subbing in x+1, you should just have (x+1)^2*(1-(x+1)) which simplifies to (x+1)^2 * (-x) i.e.y= -x(x+1)^2there is no need to expand anything ... the answer is directly visible ... but if not, just sub x=0 in ..
I would keep it factorised to be honest, looks neater but it really does not matter. All the question now wants is for you to find the y-intercept so there is no particular best way to write your answer.
What confuses me is how to work out the equation as the answer in the back of the book is -x(x + 1)^2
for part c, when subbing in x+1, you should just have (x+1)^2*(1-(x+1)) which simplifies to (x+1)^2 * (-x) i.e.y= -x(x+1)^2there is no need to expand anything ... the answer is directly visible ... but if not, just sub x=0 in ..
Will you need to expand the brackets to work out that it simplifies to that as I don't see how you've got that