Question

x4-y4+x2-y2 what is the answer​

Answer 1

Answer:  $(x + y) (x - y) [x^{2} + y^{2} - 1]$

Step-by-step explanation:

⇒  $x^{4} - y^{4} + x^{2} - y^{2}$

⇒  $[{(x^{2})^{2} - (y^{2})^{2}] + x^{2} - y^{2}$

⇒  $(x^{2} + y^{2} ) (x^{2} - y^{2} ) + x^{2} - y^{2}$

⇒  $(x^{2} - y^{2} ) [ x^{2} + y^{2} +1 ]$

⇒  $(x + y) (x - y) [x^{2} + y^{2} - 1]$

Hope it helps...

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