[Math] convert circuit to nor only gates

Question

for an assignment I need to convert a circuit to NOR gates only circuit.

(A+B)C + D

I know that morgan's theorem states:

(a) (A+B)'=A'B'
(b) (AB)'=A'+B'

I've seen online how to convert some gates to nor gates, for example the NOT gate to a NOR gate with the input tied together..
But I am not able to apply the morgan's theorem on my circuit has there are 4 inputs.
Any hints?

thanks!

Answer 1

here the circuit I have been able to write.. P is instead of D