Question

simplify (5x square - y square) ( X square + 3y square ) + (2x square + y square ) ( X square - 3y square )​

Answer 1

Answer:

Step-by-step explanation:

(5x^2 - y^2)(x^2 + 3y^2) + (2x^2 + y^2)(x^2 - 3y^2) = 5x^4 + 15x^2 . y^2 - x^2 . y^2 - 3y^4 + 2x^4 - 6x^2 . y^2 + x^2 . y^2 - 3y^4

                                                                                  = 7x^4 + 9x^2 . y^2 - 6y^4