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Last updated at Aug. 3, 2021 by

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Ex 4.3 ,3 Find the roots of the following equations: (ii) 1/(๐ฅ + 4)โ1/(๐ฅ โ 7)=11/30,๐ฅโ โ4, 7 1/(๐ฅ + 4)โ1/(๐ฅ โ 7)=11/30 ((๐ฅ โ 7) โ (๐ฅ + 4))/((๐ฅ + 4)(๐ฅ โ 7)) = 11/30 (๐ฅ โ 7 โ ๐ฅ โ 4)/((๐ฅ + 4)(๐ฅ โ 7)) = 11/30 (โ11)/((๐ฅ + 4)(๐ฅ โ 7))=11/30 โ(11 ร 30)/11=(๐ฅ+4)(๐ฅโ7) โ30 = (x + 4) (x โ 7) (x + 4) (x โ 7) = โ30 x (x โ 7) + 4 (x โ 7) = โ30 x2 โ 7x + 4x โ 28 = โ30 x2 โ 3x โ 28 = โ30 x2 โ 3x โ 28 + 30 = 0 x2 โ 3x + 2 = 0 Factorizing by quadratic method Comparing with ax2 + bx + c = 0 Here a = 1, b = โ 3, c = 2 We know that D = b2 โ 4ac D = ( โ 3)2 โ 4ร1ร2 D = 9 โ 8 D = 1 Hence roots to equation are x = (โ ๐ ยฑ โ๐ท)/2๐ Putting the values x = (โ (โ 3) ยฑ โ1)/(2 ร 1) x =(3 ยฑ 1)/2 Solving Hence x = 2 and x = 1 are the roots of the equation

Ex 4.3

Ex 4.3, 1 (i)
Deleted for CBSE Board 2022 Exams

Ex 4.3, 1 (ii) Important Deleted for CBSE Board 2022 Exams

Ex 4.3, 1 (iii) Deleted for CBSE Board 2022 Exams

Ex 4.3, 1 (iv) Important Deleted for CBSE Board 2022 Exams

Ex 4.3, 2 (i)

Ex 4.3, 2 (ii)

Ex 4.3, 2 (iii)

Ex 4.3, 2 (iv) Important

Ex 4.3, 3 (i) Important

Ex 4.3, 3 (ii) You are here

Ex 4.3, 4

Ex 4.3, 5

Ex 4.3, 6

Ex 4.3, 7 Important

Ex 4.3, 8 Important

Ex 4.3, 9 Important

Ex 4.3, 10 Important

Ex 4.3, 11

Chapter 4 Class 10 Quadratic Equations (Term 2)

Serial order wise

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.