# Math Help - Tangent question.

1. ## Tangent question.

Find the value of the constant c so that the tangent at the origin to the curve
$y = x(c-x^2)$
makes an angle of 45 degrees with the positive x axis

Not really sure what it means with the angle (tan45=1)??
I differentiated it and got c = 3x^2
Is that right?
Thanks

2. That it asks you, is that the curve should just touch the line y = x, which is at 45 degrees with the x axis.

Can you try again with this in mind?