Answer:
I’m assuming you’re asking for the proof here.
Since you’ve used a4 to represent a^4, I’m going to use that too.
Let a2= X; b2= Y
Now, a4-b4= X2-Y2
= (X + Y) (X - Y)
=(a2 + b2) (a2- b2)
=(a2 + b2) (a + b) (a - b)
=(a + b) (a - b) (a2 + b2)
Hence, proved.
Hope that helped!
Step-by-step explanation:
