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Mathematics, 06.07.2020 16:01 toddb8106

Se x .y = 2 e x + y = 9, então x² + y² é : a) 76

b) 167

c) 77

d) 169

e) 85

Classifique cada sentença em verdadeira ou falsa:

( ) ( a +b )² = a² + 2ab + b²

( ) ( a - b )² = a² - 2ab + b²

( ) ( a + b ) .( a – b) = a² + b²

( ) ( a +b)³ = a³ + 3a²b + 3ab² + b³

( ) ( a -b)³ = a³ - 3a²b + 3ab² - b³

Fatore cada polinômios de acordo com o caso:

a) m² - 14am + 49a² =

b) m2 – 9n² =

c) 30+ 5xy + 12a +2axy =

d) 8a²b + 10ab²

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Se x .y = 2 e x + y = 9, então x² + y² é : a) 76

b) 167

c) 77

d...
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