Correction at 1:02:47
It should be MULTIPLICATION not Addition between two expressions.
It obviously gives wrong simplified output and wrong circuit. My apologies for that.
but just follow the process on how to simplify and on how to draw the circuit to get the correct answer.
Again my apologies for this error.
IMPORTANT NOTE: Be careful in writing the expressions especially in writing the correct operator ( PLUS or DOT ) as well as be careful in writing variable that has a (BAR or NO BAR), because it might give you a wrong output of the circuit.