x=-1,2使原式为0,所以(x+1),(x-2)是原式的因式
原式=(4x^4-8x^3)-(8x^3-16x^2)-(7x^2-14x)
+(5x-10)
=(x-2)(4x^3-8x^2-7x+5)
4x^3-8x^2-7x+5
=(4x^3+4x^2)-(12x^2+12x)+(5x+5)
=(x+1)(4x^2-12x+5)
=(x+1)(2x-1)(2x-5)
∴原式=(x+1)(x-2)(2x-1)(2x-5)
x=-1,2使原式为0,所以(x+1),(x-2)是原式的因式
原式=(4x^4-8x^3)-(8x^3-16x^2)-(7x^2-14x)
+(5x-10)
=(x-2)(4x^3-8x^2-7x+5)
4x^3-8x^2-7x+5
=(4x^3+4x^2)-(12x^2+12x)+(5x+5)
=(x+1)(4x^2-12x+5)
=(x+1)(2x-1)(2x-5)
∴原式=(x+1)(x-2)(2x-1)(2x-5)