(2x - 4y)² - 4 (2x - 4y)-21 factories
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LET, (2x-4y)=a
a^2-4a^2-21
a^2-7a+3a-21
a^2+3a-7a-21
a(a+3) -7(a+3)
(a+3) (a-7)
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