CBSE Class 10-Mathematics: Chapter – 4 Quadratic Equations Part 17 (For CBSE, ICSE, IAS, NET, NRA 2022)

Get unlimited access to the best preparation resource for CBSE : fully solved questions with step-by-step explanation- practice your way to success.

Question 4:

Find the roots of the following equations:

(i)

(ii)

Answer:

(i)

Comparing equation with general form ,

We get

and

Using quadratic formula to solve equation,

(ii)

Comparing equation with general form ,

We get

and

Using quadratic formula to solve equation,

Question 5:

The sum of reciprocals of Rehman՚s ages (in years) 3 years ago and years from now is . Find his present age.

Answer:

Let present age of Rehman years

Age of Rehman 3 years ago years.

Age of Rehman after 5 years years

According to the given condition:

Comparing quadratic equation with general form ,

We get

and

Using quadratic formula

We discard . Since age cannot be in negative.

Therefore, present age of Rehman is years.