Question

desenvolva as expressoes seguintes:
1- (a²+4ab-ab²) . (a²+4ab+ab²)
2- (2x+3y-4z) . (2x-3y+4z)

Answer 1

1- (a² +4ab -ab²) . (a² +4ab +ab²) =
     2a²⁺² +16a¹⁺¹b¹⁺¹ -a¹⁺¹b²⁺² =
     2a⁴   +16a²b² -a²b⁴

2- (2x +3y -4z) . (2x  -3y+4z) =
     4x¹⁺¹ -9y¹⁺¹ -16z¹⁺¹ =
     4x²    -9y²   -16z²