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2014-08-21T16:16:55+07:00

a+b=6
a.b=4
a² + b² = ?

(a+b)(a+b) = 2.6
a² + 2ab + b² = 12
a² + 2.(4) + b² = 12
a² + 8 + b² = 12
a² + b² = 12 - 8
a² + b² = 4

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