Given y = 2x(x2 – 1)5, show that (a) dy/dx = g(x)(x2 – 1)4 where g(x) is a function to be determined. (b) Hence find the set of values of x for which dy/dx > 0

Given = 2x(x2 – 1)5, show that
(a) dy/dx = g(x)(x2 – 1)4 where g(x) is a function to be determined.

dy/dx= (2)(x2 – 1)5 + (2x)*5(x2– 1)4(2x)

dy/dx= (x2 – 1)4( 2(x2 – 1) + 20x2 )

g(x) = 2(x2 – 1) + 20x2

(b) Hence find the set of values of x for which dy/dx > 0
(x2 – 1)4( 2(x2 – 1) + 20x2 ) = 0

2(x2 – 1) + 20x2 = 0

22x2 - 2 = 0
2(11x2 - 1) = 0

11x2 = 1

x = +-√(1/11)

AI
Answered by Abi I. Maths tutor

10667 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

Find the first four terms in the binomial expansion of (2 + x) ^5


The curve C has equation y = (x^2 -4x - 2)^2. Point P lies on C and has coordinates (3,N). Find: a) the value of N. b) the equation of the tangent to C at the point P, in the form y=mx+c where m and c are constants to be found. c) determine d^2y/dx^2.


You are given that n is a positive integer. By expressing (x^2n)-1 as a product of factors, prove that (2^2n)-1 is divisible by 3.


Find the first derivative of y=2^x


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:

© 2026 by IXL Learning