Question

Atividade De Revisão

Resolva:

a)
$(a - 2 {)}^{2}$
b)
$(a - 3 {)}^{2}$
c)
$(a + 6).(a - 6)$
d)
$(6x + 8 {)}^{2}$

e)
$(4a - 6 {)}^{2}$
f)
$(9x + 6).(9x - 6)$
g)
$(a + 2 {)}^{2}$

Answer 1

( a - 2)² = [ (a)² - 2 * 2 * a + (2)²] = a² - 4a + 4 ***

b

( a - 3)² = [ (a)² - 2 * 3 * a + ( 3)² ] = a² - 6a + 9 ****

c

( a + 6) ( a - 6 ) = [ (a)² - (6)²] = a² - 36 ****

d

( 6x + 8)² = [ (6x)² + 2 * 6x * 8 + (8)² ] = 36x² + 96x + 64 ***

e

( 4a - 6)² = [ (4a)² - 2 * 4a * 6 + (6)² ] = 16a² - 48a + 36 ***

f

( 9x + 6) ( 9x - 6) = [ (9x)² - (6)² ] = 81x² - 36 ****

g

( a + 2)² =[ (a)² + 2 * a * 2 + ( 2 )² ] = a² + 4a + 4 ***