Question

1- faturação por agrupamento

f)
$7 \times + 7y + ax+ ay$

g)
$a {}^{2} + ay - 4a - 4y$

h)
$x {}^{3} + x {}^{2} - x - 1$

i)
$4am - 2an - 12dm - 6bn$

Answer 1

F)

7x - 7y + ax + ay

7 .(x - y) . a(x + y)

=> (a + 7) . (x + y)

===

G)

a² + ay - 4a - 4y

a(a + y) - 4(a + y)

=> (a - 4) . (a + y)

===

H)

x³ + x² - x - 1

x² (x + 1) - (x -1)

(x + 1).(x + 1).(x - 1)

=> (x + 1)².(x - 1)

===

J)

4am - 2an - 12dm - 6bn

4am - 6dn - 12dm - 2an

=> 4m(a - 3d) - 2n.(a + 3b)