factorise a square + b square +2ab+2bc+2ca
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a^2+b^2+2ab+2bc+2ca
=(a+b)^2-2ab+2ab+2bc+2ca
=(a+b)^2+2bc+2ca
=(a+b)^2+2c(a+b)
=(a+b)(a+b+2c)
=(a+b)^2-2ab+2ab+2bc+2ca
=(a+b)^2+2bc+2ca
=(a+b)^2+2c(a+b)
=(a+b)(a+b+2c)
sabrina789:
thanks
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