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= 2pq × ( 2q + 3 )
b. 4a² - 9b²
= ( 2a - 3b ) × ( 2a + 3b )
c. 2t² - 32
= 2 ( t - 4 ) × ( t + 4 )
d. x² - 6x + 9
= ( x - 3 )²
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