Express (2root5 - 3root10)^2 in the form a+broot2 and hence find the values of a and b. If you can please help and explain the method and how to solve equations similar to this. :) Thanks

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- March 6th 2013, 09:31 PMalicesaydeBasic Arithmetic and Surds
Express (2root5 - 3root10)^2 in the form a+broot2 and hence find the values of a and b. If you can please help and explain the method and how to solve equations similar to this. :) Thanks

- March 6th 2013, 10:47 PMveileenRe: Basic Arithmetic and Surds
That is not an equation. Anyway:

, so:

a = 50, b = -60 - March 6th 2013, 10:49 PMMINOANMANRe: Basic Arithmetic and Surds
Alice

show us some of your work...apply the well known identity (a-b)^2 =a^2+b^2-2ab....where a and b could be anything...in your case 2root5 or 2root10......try it