Slide15.JPG

Slide16.JPG

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


Transcript

Ex 4.1, 2 Represent the following situations in the form of quadratic equations : (iii) Rohan’s mother is 26 years older than him. The product of their ages (in years) 3 years from now will be 360. We would like to find Rohan’s present age. Let Rohan's age = x ∴ Rohan’s mother age = x + 26 After 3 years Rohan’s age = x + 3 Rohan’s mother age = (x + 26) + 3 = x + 29 Now, Product of ages after 3 years = 360 (x + 3) (x + 29) = 360 x (x + 29) + 3 (x + 29) = 360 x2 + 29x + 3x + 87 = 360 x2 + 29x + 3x + 87 – 360 = 0 x2 + 32x – 273 = 0 It is the form of ax2 + bx + c = 0 Where a = 1, b = 32 , c = –273 Hence, it is a quadratic equation .

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

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.