Question

calcule:
a (x+7).(x+5)
b (y-6).(y+5)
c (2a+b).(a-2b)
d (ab+6).(ab-2)

Answer 1

( X + 7 ) . ( X + 5 ) =
X² + 5 X + 7 x + 35 =
X² + 12 X + 35
====================

( Y - 6 ) . ( Y + 5 ) =
 Y² + 5 y - 6 Y - 30 =
  Y² - y - 30
===================

( 2a + b ) . ( a - 2b ) = 
2a² - 4ab + ab - 2b² =-
2a² - 3ab - 2b²
======================

(ab + 6 ) . ( ab - 2 ) =
a²b² - 2ab + 6ab - 12 =
a²b² + 4ab -12

Answer 2

Resposta:

( X + 7 ) . ( X + 5 ) =

X² + 5 X + 7 x + 35 =

X² + 12 X + 35

====================

( Y - 6 ) . ( Y + 5 ) =

Y² + 5 y - 6 Y - 30 =

 Y² - y - 30

===================

( 2a + b ) . ( a - 2b ) =  

2a² - 4ab + ab - 2b² =-

2a² - 3ab - 2b²

======================

(ab + 6 ) . ( ab - 2 ) =

a²b² - 2ab + 6ab - 12 =

a²b² + 4ab -12

Explicação passo-a-passo: