a+b=6a.b=4a² + b² = ?
(a+b)(a+b) = 2.6a² + 2ab + b² = 12a² + 2.(4) + b² = 12a² + 8 + b² = 12a² + b² = 12 - 8a² + b² = 4
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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