Question 671314
(7x-2y)(2x+7y)
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Use foil
{{{7x(2x) + 7x(7y) - 2y(2x) - 2y(7y)}}}
{{{14x^2 + 49xy - 4xy - 14y^2}}}
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Combine like terms
{{{highlight_green(14x^2 + 45 - 14y^2)}}}
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