why is (x+y)^2 ≠ x^2 + y^2

Because if we simply expand (x+y)2 we'd get x2+y2+2xy which shows that there's an extra term which is 2xy. another practical way to check your work and see why LHS ≠ RHS is by substituting random numbers, i.e. if x=2 and y=3 then LHS =25 whilst RHS =13, hence by adding 2xy=2(2)(3)=12 to the 13 it would give us 25.

Answered by Jamal H. Maths tutor

2642 Views

See similar Maths 13 Plus tutors

Related Maths 13 Plus answers

All answers ▸

The distance of a particle from its start point with respect to time is given by the equation s = 5t^2 + 2t + 4, what is the acceleration of the particle at time t?


2x + 3y = 8 and 3x + 2y = 7 find x and y


Solve the quadratic equation x^2+4x+6=0


How to solve a quadratic equation by using the discriminant or by factoring?


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