Question

$4x (5xy - 2y + {7x}^{2} y)$
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Answer 1

$20 {x}^{2} y \: \: \: \: \: \: - 8xy \: \: \: \: \: \: + 28 {x}^{3} y$

$20 {x}^{2} y + 20xy - 28xy + 28 {x}^{3} y$

$20xy(x + 1) - 28xy(1 - {x}^{2} )$

$4xy(5(x + 1) - 6(1 - {x}^{2} ))$