Question

(xy+x)(xy+8) quanto é ? e (3cd-3x)(4cd-8x) ?

Answer 1

(x y + x) (x y + 8 ) = 
x² y² + x² y + 8 x y + 8 x

(3 C D - 3 X) ( 4 C D - 8 X) = 
24 X² + 12 C² D² - 36 C D X