Question

MATEMÁTICA
a) ( + 5 x ) . ( - 4 x² ) = - 20 x³
b) ( - 2 x ) . ( + 3 x )
c) ( + 5 a ) . ( + 4 a )
d) ( - a ) . ( + 6 a )
e) ( - 2 a ) . ( 5 a )
f) ( + 4 x² ) . ( + 5 x³ )
g) ( + 2 a ) . ( - 7 b )

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Answer 1

Explicação passo-a-passo:

sinais:

+ e - = -

+ e + = +

- e + = -

- e - = +

a) ( + 5 x ) . ( - 4 x² ) = - 20 x³

b) ( - 2 x ) . ( + 3 x ) = -6x²

c) ( + 5 a ) . ( + 4 a ) = 20a²

d) ( - a ) . ( + 6 a ) = -6a²

e) ( - 2 a ) . ( 5 a )= -10a²

f) ( + 4 x² ) . ( + 5 x³ ) = 20x⁵

g) ( + 2 a ) . ( - 7 b ) = -14ab