Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
-243 + 5(-3)^4(2x)
5C1(2x)^4(-3)^1
10(2x)^3(-3)^2
10(2)^3x^3*(-3)^2
Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.