# CBSE Class 10-Mathematics: Chapter –4 Quadratic Equations Part 17

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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.