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Question

Expansion of (x+y+z)2 :


A
x2+y2+z2+2(xy+yz+zx)
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B
x2+y2+z22(xy+yz+zx)
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C
x2+y2+z22(xyyz+zx)
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D
x2+y2+z2+2(xyyz+zx)
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Solution

The correct option is A x2+y2+z2+2(xy+yz+zx)
Use identity
(a+b+c)2=a2+b2+c2+2(ab+bc+ca)

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