Question

efetue os calculos 
 $2 x^{4}.2 x^{4}$
$8 \alpha :4 \alpha$
$(-2y)-(-2y)$

Answer 1

 = 4x^8
 = 2 alfa
   - 2y + 2y = 0

Answer 2

 = $4x^8$
 = 2
 = 0