Resposta:
(a + b)² = ( a + b) . (a + b) ... a) (3 + x)² = ( R: 9 + 6x +x²)b) (x + 5)² = ( R: x² + 10x + 25) c) ( x + y)²
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Resposta:
(a + b)² = ( a + b) . (a + b) ... a) (3 + x)² = ( R: 9 + 6x +x²)b) (x + 5)² = ( R: x² + 10x + 25) c) ( x + y)²