Great britain justified raising taxes on colonists because of which event?

The question asks "great britain justified raising taxes on colonists because of which event". The events used by Great Britain to justify the rise of the taxes on american colonists was the French and the Indian war. The empire needed to use all possible resources to control and win this conflicts in Europe and Asia.

2. x2 + 8x + 12 = 0 to prove: x = -6 or x = -2