Question

x2-x+14因式分解

Answer 1

用求根法:a=1,b=-1,c=14b^2-4ac=(-1)^2-4*1*14=-55要用到复数了:√(-55)=√(55)*i,其中i=√(-1)x1=(1+√(55)*i)/2x2=(1-√(55)*i)/2∴原式=(x-1/2-√(55)*i/2)(x-1/2+√(55)*i/2)