1. (5x + 7)(3x + 4)
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Answer:
( 5x + 7 ) ( 3x + 4 )
Step-by-step explanation:
= 15 x^2 + 20x + 21x + 28
= 5x ( 3x + 4 ) +7 ( 3x + 4 )
= ( 5x + 7 ) ( 3x + 4 )
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