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[because , 2a is multiplied with 3a , 2a is multiplied with -6 , +5 is multiplied with 3a and +5 is multiplied with -6]

[because , -12a is subtracted from +15a]

= 6a2 + 3a – 30

= 3(2a2 + a – 10)

= 3(2a2 + a – 10)