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=28a² + 3a
= a( 28a + 3 )
b. 5y - 10y + 13y
= 8y
c. 6pq + 5p² - 8pq - p² + pq
= - pq + 4p²
= p( - q + 4p )
d. 8(a + 2b) - 12(2a - b)
= 8a + 16b - 24a + 12b
= - 16a + 28b
= 4( - 4a + 7b )