Tolong bantu yg a sama yg b

Nomor 1 :
a). 4 (3a + 2)
= (4 x 3a) + (4 x 2)
= 12a + 8
b). (x + 3) (x - 2)
= (x)(x) + (x)(-2) + (3)(x) + (3)(-2)
= x² - 2x + 3x - 6
= x² + x - 6