(x(x+1))/2 = 3 Solve For x.

Multiply both sides by 2 ( (x(x + 1) ) = 6 )Multiply out the brackets ( x2 + x = 6 )Bring the 6 across ( x2 + x - 6 = 0 )Either using the quadratic formula or spotting the factors solve for x ( x = -3 or x = 2 )

Answered by Robert T. Maths tutor

2073 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Solve the equation (2x-1)/3 + (x+2)/2 +x/6 = 8


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.


Simplify: y+y-x×x


A bag contains 5 red beads and 7 blue beads. Two beads are removed at random without replacement. Workout the probability that the two beads are the same colour.


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