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

CB
Answered by Ciaran B. Maths tutor

5641 Views

See similar Maths Scottish Highers tutors

Related Maths Scottish Highers answers

All answers ▸

Express '2x^2 + 8x + 30' in the form 'a(x+b)^2 + c'


Solve algebraically the system of equations: 4x+5y=-3 and 6x-2y=5


Find the stationery points of x^3 + 3x^2 - 24x + 7 and determine whether the slope is increasing or decreasing at x=3.


A triangle has vertices A(-3,5), B(7,9) and C(2,11). What is the equation of the median that passes through the vertex C?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning