Question

1) Calcule o quadrado da soma nos itens a seguir:

a) ( x + 2 )² =

b) ( 1 + 5 a )² =

c) ( 3 a + 2 )² =

d) ( 3 x + 2 y )² =

e) ( a 3 + 5 b )² =

f) ( 4 a + y 3 )² =

g) ( 2 a + 3 b )² =

h) ( 9 y + 1 )² =

i) ( y + 2/3 )² =

j) ( ¾ x + 2/5 y )² =

Answer 1

Resposta:

a) (x + 2 )^2 = (x + 2) * (x + 2) = x^2 + 2x + 2x + 4 = x^2 + 4x + 4

b) (1 + 5a)^2 = (1 + 5a) * (1 + 5a) =

1 + 5a + 5a + 25a^2 = 1 + 10a + 25a^2 ou

25a^2 + 10a + 1

c) (3a + 2)^2 = (3a + 2) * (3a + 2) =

9a^2 + 6a + 6a + 4 = 9a^2 + 12a + 4

d) (3x + 2y)^2 = (3x + 2y) * (3x + 2y) =

9x^2 + 3x2y + 3x2y + 4y^2 =

9x^2 + 6x4y + 4y^2

Explicação passo-a-passo: