How can we expand (ab+bc+ac)²
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identity = (a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca
therefore , (ab+bc+ca)^2
=(ab)^2+(bc)^2+(ca)^2+2(ab)(bc)+2 (bc)(ca)+2 (ca)(ab)
=a^2b^2+b^2c^2+c^2a^2+2acb^2 +2abc^2+2cba^2
therefore , (ab+bc+ca)^2
=(ab)^2+(bc)^2+(ca)^2+2(ab)(bc)+2 (bc)(ca)+2 (ca)(ab)
=a^2b^2+b^2c^2+c^2a^2+2acb^2 +2abc^2+2cba^2
qnorbu:
(ab+bc+ac) is mine question
yaa
so
identity will be used
for expanding it
if you will expand it by multiplying it by itself then it will become complicated
so we can use identity for it
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