Answer:
Step-by-step explanation :
Since (a+b)^2=a^2+b^2+2ab
So a^2+b^2= (a+b)^2-2ab
Here (10)^2+(20)^2=(10+20)^2-2*10*20
=30^2-400
=900-400
=500
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Answer:
Step-by-step explanation :
Since (a+b)^2=a^2+b^2+2ab
So a^2+b^2= (a+b)^2-2ab
Here (10)^2+(20)^2=(10+20)^2-2*10*20
=30^2-400
=900-400
=500