Find the product:


Find the product:
(2x2 − 5y2) × (x2 + 3y2)


By horizontal method:

$\left(2 x^{2}-5 y^{2}\right) \times\left(x^{2}+3 y^{2}\right)$

$=2 x^{2}\left(x^{2}+3 y^{2}\right)-5 y^{2}\left(x^{2}+3 y^{2}\right)$

$=2 x^{4}+6 x^{2} y^{2}-5 x^{2} y^{2}-15 y^{4}$

$=2 x^{4}+x^{2} y^{2}-15 y^{4}$


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