$$5x-7y^{2}; 3x^{2}-4y^{2}$$
$\left(5x-7y^{2}\right)\left(3x^{2}-4y^{2}\right)$
$$\left(5x-7y^{2}\right)\left(3x^{2}-4y^{2}\right)$$
$$15x^{3}-21x^{2}y^{2}-20xy^{2}+28y^{4}$$
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$5x-7y^{2},\ 3x^{2}-4y^{2}$
