MCQ PracticeIf 1 + 9r 2 + 81r 4 = 256 and 1 + 3r + 9r 2 = 32, then find the value of 1 - 3r + 9r 2 .Subject: MathematicsTopic: AlgebraA8B4C16D12Correct Answer: APractice QuizBack to MCQsRelated MCQsCurrent flows in a circuit whenEighttenths coulomb passes a point in 4 s. The current in amperes isThe unit of electrical charge is the