Show that (x+2)(x+3)(x+4) can be written in the form of ax^3+bx^2+cx+d where a, b, c and d are positive integers.

This is a 'show that' question which means that you need to prove that something is true. This question wants you to rewrite (x+2)(x+3)(x+4) into the form of ax^3+bx^2+cx+d. To do this, we have to expand the original formula. It is much easier to do this in two steps rather than expand the formula in one step.So we start with the first two. (x+2)(x+3)(x+4)=(x2+2x+3x+6)(x+4)=(x2+5x+6)(x+4)So now we only have two brackets to expand. We start by multiplying everything in the first bracket by x and then by 4.= (x3+ 5x2+ 6x + 4x2 +20x + 24)We simplify this by adding together numbers with the same coefficient.= (x3 + 9x2 + 26x + 24)so expanded the formula is now x3 + 9x2 + 26x + 24.This has successfully taken the form of ax3 +bx2 + cx + d.a=1, b=9, c=26 and d=24.

AH
Answered by Alicia H. Maths tutor

7880 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Solve 3x^2 + 6x – 2 = 0 Give your solutions correct to 2 decimal places.


Solve the equation 3a^2+4a+1=3 for all values of a. Give your answers to 3 significant figures.


Solve the simultaneous equations: 3x + 4y = 5 and 2x – 3y = 9


The equation of line L1 is y = 3x-2 and the equation of line L2 is 3y-9x+5 = 0. Show that these two lines are parallel.


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