Factorize : a4-2a2b2+b4

Matching exercise

    
Match the items on the right to the items on the left.
Step 1
Step 2
Step 3
Step 4
a4-2a2b2+b4=a22-2×a2×b2+b22
=a2-b22
=(a+b)(a-b)2
=a-b2(a+b)2