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b . -7p² + 4pq - 6 + 3p² - pq - 9 = (-7+3)p² +(4-1)pq-15=-4p² +3pq-15
= - 8m - mn
= - m ( 8 + n ) atau bisa juga m (-8 - n )
b. -7p² + 4pq - 6 + 3 p² - pq - 9 = -7p² + 3p² + 4pq - pq - 6 - 9
= -4 p² + 3pq - 15
atau bisa juga di sederhanakan menjadi
= p (-4p + 3q) - 15 atau = -4p² + 3 ( pq - 5)
atau = -4p² -6 + 3pq -9
= -2 ( p²+ 3) + 3 ( pq - 3 )