A curve has equation y = x^3 - 6x^2 - 15x. The curve has a stationary point M where x = -1. Find the x-coordinate of the other stationary point on the curve.

A stationary point can be found when dy/dx = 0. The first thing we need to do is differentiate y to find dy/dx, and solve it for dy/dx = 0. This gives usdy/dx = 3x2 - 12x - 15 = 0 = (3x + 3)(x - 5) = 0 (using quadratic formula)Therefore x = -1 and x = 5.The question already gives us x = -1, so the answer is x = 5.

Answered by Ellie G. Maths tutor

7484 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

Integrate the following expression with respect to x by parts: (2*x)*sin(x)


Find the equation of the normal to the curve x^3 + 2(x^2)y = y^3 + 15 at the point (2, 1)


Particle A mass 0.4kg and B 0.3kg. They move in opposite direction and collide. Before collision, A had speed 6m/s and B had 2m/s. After collision B had 3m/s and moved in opposite direction. Find speed of A after collision with direction and Impulse on B.


Why do I need to add the + C when finding an indefinite integral?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences