Question

Produtos Notáveis
A) (5-2z)²-(25+10z)=
B) (3x+1)²+(3x-1)²-2=
C)(x-3)•(x+3)-x•(x-3y)=
D) (5a+3)²+(5a-3)²-2(a+5)=

Answer 1

A) (5-2z)²-(25+10z)=

25 - 20z + 4z^2 - 25 - 10z ==> - 30z + 4z^2
================================================
B) (3x+1)²+(3x-1)²-2=

9x^2 + 6x + 1 + 9x^2 - 6x + 1 - 2 ==> 18x^2 
=====================================================
C)(x-3)•(x+3)-x•(x-3y)= 

x^2 - 9 - x^2 + 3xy ==> 3xy - 9  
======================================================
D) (5a+3)²+(5a-3)²-2(a+5)=
25a^2 + 30a + 9 + 25a^2 - 30a + 9 - 2a - 10

50a^2 - 2a + 8