expand (2x+y+3x)square by using identity
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(a+b)^2=a^2+2ab+b^2
2x+y+3x=5x+y
=(5x)^2+2×5x×y+y^2
=25x^2+10xy+y^2
hope this helps and mark me as brainliest if it does please please...
Answered by
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(a+b)²=a²+b²+ 2ab ....
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