Question

x的四次方加x的三次方减3x的平方减4x减4

Answer 1

原式=(x⁴-3x²-4)+(x³-4x)

=(x²+1)(x²-4)+x(x²-4)

=(x²-4)(x²+1+x)

=(x+2)(x-2)(x²+x+1)