Question 166483
[3a - (2a - 3)][3a + (2a - 3)]
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= [3a-2a+3] * [3a+2a-3]

= [a+3] * 5a-3]

Use FOIL to get:

= 5a^2 -3a + 15a -9

= 15a^2 + 12a - 9

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Cheers,
Stan H.