(ab+bc)²-2ab²c do it with identity
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(ab+bc)^2--2ab^2c
=( ab)^2+(bc)^2+2ab^2c-2ab^2c
=(ab)^2+(bc)^2
means (ab+bc)^2-2ab^2c=(ab)^2+(bc)^2
=( ab)^2+(bc)^2+2ab^2c-2ab^2c
=(ab)^2+(bc)^2
means (ab+bc)^2-2ab^2c=(ab)^2+(bc)^2
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