Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
x^3 - 3x^2y + 3xy^2 - y^3
x^3 + 3x^2y + 3xy^2 + y^3
x^3 + 3x^2y - 3xy^2 - y^3
x^3 - 3x^2y - 3xy^2 + y^3
Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.