把多项式-2x^3+8x分解因式,正确的( )a.-2x(x^2-4) b.(x^2+4) c.-2x(x+2)(x-2) d.2x(x-2)(x+2)
问题描述:
把多项式-2x^3+8x分解因式,正确的( )a.-2x(x^2-4) b.(x^2+4) c.-2x(x+2)(x-2) d.2x(x-2)(x+2)
答
-2x^3+8x
=-2x(x^2-4)
=-2x(x+2)(x-2)
选C