Answer :

[tex]64x^6-x^4=x^4(64x^2-1)=x^4\left[(8x)^2-1^2\right]=x^4(8x-1)(8x+1)\\\\\\\\a^2-b^2=(a-b)(a+b)[/tex]
deathstrike001
1)x^4(8x-1)^2
=x^4(64x^2-16x+1)
=64x^6-16x^5+x^4

2)(8x^3-x^2)^2
=64x^6-16x^5+x^4

3)x^4(8x-1)(8x+1)
=x^4(64x^2-1)
=64x^6-x^4

4)x^4(64x^2-1)
=64x^6-x^4

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