( 7 a b − 3 b² ) − ( − 5 b² + 5 a b − 2 a² ) =7ab-3b²+5b²-5ab+2a² =
= 2b²+2ab+2a² = 2*(b²+ab+a²)
если a = 2 и b = − 2 2*((-2)²+2*(-2)+2²)= 2*4=8
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( 7 a b − 3 b² ) − ( − 5 b² + 5 a b − 2 a² ) =7ab-3b²+5b²-5ab+2a² =
= 2b²+2ab+2a² = 2*(b²+ab+a²)
если a = 2 и b = − 2 2*((-2)²+2*(-2)+2²)= 2*4=8