Question

因式分解m^2-6m+8和x^4+4

Answer 1

m^2-6m+8=(m-2)(m-4)(十字相乘法)

x^4+4

=(x^2)^2+2^2+2*2*x^2-4x^2

=(x^2+2)^2-4x^2

=(x^2+2)^2-(2x)^2

=(x^2+2x+2)(x^2+2-2x)