# CBSE Class 10-Mathematics: Chapter –4 Quadratic Equations Part 21

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## 4 Mark Questions

**Question 1:**

Find the roots of the following Quadratic Equations by applying quadratic formula.

(i)

(ii)

(iii)

(iv)

**Answer:**

(i)

Comparing quadratic equation with general form , we get, and Putting these values in quadratic formula

(ii)

Comparing quadratic equation with the general form , we get and Putting these values in quadratic formula

(iii)

Comparing quadratic equation with the general form , we get *a*

Putting these values in quadratic formula

A quadratic equation has two roots. Here, both the roots are equal.

Therefore,

(iv)

Comparing quadratic equation with the general form , we get and Putting these values in quadratic formula

But square root of negative number is not defined.Therefore, Quadratic Equation has no solution.