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

2645 Views

See similar Maths 13 Plus tutors

Related Maths 13 Plus answers

All answers ▸

The following sequence reads: 8, 5, 2, -1. What are the 4th and 50th terms of this sequence?


Mike has 4 blue balls, 6 green balls and 10 yellow balls what is the probability that he will pick a yellow ball.


If area of cube is 96, what is its volume?


Find the 100th term in the sequence 3, 7, 11, 15...


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