plis jawab soal mtk ku tlong

1a) 12x³ + 4x²
----------------------
2x²
= (2x²)(6x + 2)
-----------------------
2x²
= 6x + 2

b) x² + 5x + 6
-----------------------
x + 2
= (x + 2)(x + 3)
-----------------------
(x + 2)
= x + 3

c) 2x² - x - 10
--------------------
(x + 2)
= (2x - 5)(x + 2)
------------------------
x + 2
= 2x - 5

d) 2x³ + 7x² - 14x - 40
---------------------------------
( 2x - 5)
= (2x - 5)(x² + 6x + 8)
-------------------------------
( 2x - 5)
= x² + 6x + 8