Given that, dy/dx = 6x^2 - 3x + 4, and y = 14 when x = 2, express y in terms of x.

dy/dx = 6x2 - 3x + 4
To retrieve the original function y from dy/dx you have to integrate the derivative with respect to x.
y = ∫(dy/dx)dxy = ∫(6x2 - 3x + 4)dx
To integrate, the power is raised by one and the whole term is then divided by the new power on x. The constant of integration is to be included since this is indefinite integration.y = 6x3/3 - 3x2/2 + 4x + cy = 2x3 - 3x2/2 + 4x + c
Since values for y and x are given, they can be substituted into the function to solve for c.y = 14 and x = 214 = 2(2)3 - 3(2)2/2 + 4(2) + c14 = 2(8) - 3(4)/2 + 8 + c14 = 16 - 6 + 8 + c14 = 18 + cc = -4Evaluating the function yields a value of c = -4.This value of c = -4 is written back into the function of y to give the final answer:y = 2x3 - 3x2/2 + 4x - 4

Answered by Ciaran B. Maths tutor

5125 Views

See similar Maths Scottish Highers tutors

Related Maths Scottish Highers answers

All answers ▸

Find an equation for the straight line AB , giving your answer in the form px+qy=r, where p, q and r are integers. Given that A has co-ordinates (-2,4) and B has co-ordinates (8,-6)


Given x^3 + 4x^2 + x - 6 = 0 , and one of the factors of this equation is (x-1), factorise and hence compute the other solutions for the eqaution.


Given f(x) = (x^(2)+(3*x)+1)/(x^(2)+(5*x)+8), find f'(x) and simplify your answer.


Differentiate 5x^2 - 7x +9


We're here to help

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