Hi, I don’t know how to do this question without finding the length and breadt

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secondary 4 | E Maths
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secondary 4 E Maths Singapore

Hi, I don’t know how to do this question without finding the length and breadth.

Date Posted: 3 years ago

done {{ upvoteCount }} Upvotes

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Date Posted: 3 years ago

3 years ago

Hello, how did u get from square root( l^2+b^2 ) to the next step?

Tham KY

3 years ago

Using (x+y)²= x²+y²+2xy expansion, rearrange gets x²+y²= (x+y)²-2xy.
Must remember, used very often even in JC...