A-Level Maths: G3-04 Gradients: Equations of Tangents

[savannahsaid]

there is a question in the edexcel workbook which asks to workout the intersection of 2 normals and their equation, "find the equation of the normals to the curve x+x^3 at points (0, 0) and (1, 2) find coordinates of point the point where these normals meet" i know you have to differentiate to find the gradient then find the reciprocal gradient of each normal and then use y-y1=m(x-x1) for each and solve . thing is everytime i calculate the workbook gives me something different. i'd like to know what answer you get when you calculate it, would help loads! for the (0, 0) i get y=x but in the workbook it says y= -x but reciprocal of 1 is 1

[lisasilva]

Good evening, could you explain why the 2 comes in front of 4x-1? I cant understand how it goes from 1:2 to that.Thanks

[rhysdavies]

how is the derivative of e to the power of x, , e the the power of x?