Question

x的四次方+x的三次方-7x²-x+6 分解因式

Answer 1

原式=(x^4-7x²+6)+(x³-x)

=(x²-1)(x²-6)+x(x²-1)

=(x²-1)(x²+x-6)

=(x+1)(x-1)(x-2)(x+3)