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

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**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.