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Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


Transcript

Ex 4.2, 3 Find two numbers whose sum is 27 and product is 182. Let First number be x Given that Sum of both numbers is 27 First number + Second number = 27 x + Second number = 27 Second number = 27 – x Also given that, Product of both numbers = 182 First number × second number = 182 x (27 – x) = 182 27x – x2 = 82 0 = x2 – 27x + 182 x2 – 27 x + 182 = 0 We factorize by splitting the middle term method x2 – 13x – 14x + 182 = 0 x (x – 13) – 14 (x – 13) = 0 (x – 14) (x – 13) = 0 Hence, 13 & 14 are the roots of the equation Now, finding the numbers Hence, two numbers are 13 & 14 For x = 13 First number = x = 13 Second number = 27 – x = 27 – 13 = 14 For x = 14 First number = x = 14 Second number = 27 – x = 27 – 14 = 13 Thus, the two numbers are 13 and 14

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.