Question

Factorise x^4-5x^2+4-y^2+2xy

Answer 1

Answer:

y(x^2-1) (x^2-4) (2x-y)

Step-by-step explanation:

x^4-4x^2-x^2+4-y^2+2xy

x^2(x^2-4)-1(x^2-4)-y^2+2xy

(x^2-1)(x^2-4)-y^2+2xy

(x^2-1)(x^2-4)+y(2x-y)

y(x^2-1)(x^2-4)(2x-y)