分解因式8x^4-8x^3-2x^2+4x-1

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分解因式8x^4-8x^3-2x^2+4x-1
分解因式8x^4-8x^3-2x^2+4x-1

分解因式8x^4-8x^3-2x^2+4x-1
原式=(8x^4-4x³)-(4x³-2x²)-(4x²-4x+1)
=4x³(2x-1)-2x²(2x-1)-(2x-1)²
=(2x-1)[4x³-2x²-(2x-1)]
=(2x-1)[2x²(2x-1)-(2x-1)]
=(2x-1)²(2x²-1)

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

8x^4-2x²-1 -8x³+4x
= (4x²+1)(2x²-1)-4x(2x²-1)
=(4x²-4x+1)(2x²-1)
=(2x-1)²(2x²-1)