(2x+1)(2x-1)=4x^2-1 (4x^2_1)(4x^+1)=16x^4-1 (16x^4-1)(16x^4+1)=256x^8-1 (ans) Use: (a+b)(a-b)=a^2-b^2 Reply
(2x+1)(2x-1)=4x^2-1
(4x^2_1)(4x^+1)=16x^4-1
(16x^4-1)(16x^4+1)=256x^8-1 (ans)
Use: (a+b)(a-b)=a^2-b^2