Question

1 (a+b) x (a-b) = ?

2 (a+b)² =
(a-b)² =
(ax + b) x (cx + d)

Answer 1

1.(a+b x (a-b) = 2a - ab + ba - b kuadrat
2.(a+b) kuadrat = (a+b) (a+b)
   (a-b) kuadrat = (a+b) (a-b)
   (ax + b) x (cx + d) = acx kuadrat + adx +bcx +bd