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Instead, notice how there are 4 of the same number, . 8) The exponent of 3, which is 42, is close to 40. C. Perez, Writer Answered: Apr 24, 2019. Adding & Subtracting Exponents Answers and Explanations . Menu; Table of Content; … A comprehensive database of more than 25 exponent quizzes online, test your knowledge with exponent quiz questions. Give Accolades ⭐ Release Score. You could solve this a few different ways, and one of those is by the guess and check method. Download free in Windows Store . 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If x 3 + y 3 = 9 and x + y = 3, then the value of x 4 +y 4 is, (A) 21 (B) 0 (C) 17 (D) 25 Answer: (C) Explanation: x 3 +y 3 = (x + y) × (x 2 − xy + y 2) Putting given values of x 3 +y 3 and (x + y) 9 = 3 × ((x+y) 2 − 3xy) = 3 × (9 − 3xy) = 27 − 9xy 9xy = 18 xy = 2 x 4 + y 4 = (x 2 + y 2) 2 - 2x 2 y 2 = (x 2 + y 2) 2 - 2*4 [Putting value of xy] = ((x + y) 2 - 2xy) 2 - 2*4 [Putting values of (x+y) and xy] = (9 - 4) 2 - 2*4 = 17. Subtract Exponents. C. 14. Get to the point IMO Level 1- Mathematics Olympiad (SOF) Class 8 questions for your exams. Login/Register. Exponents and Powers: Questions 1-13 of 61. Detailed comments/doubts about this question. Download free on Google Play. It will help you to practice the questions on the topics of maths as exponents and surds based questions of algebra. Indian Talent Olympiad Click Here. Question 2 : The perimeter of the equilateral triangle is 18. 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