# CBSE Class 10-Mathematics: Chapter –4 Quadratic Equations Part 12

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**Question 16:**

Solve for by quadratic formula

**Answer:**

**Question 17:**

Find the value of k for which the quadratic equation has real and distinct root.

**Answer:**

For real and distinct roots,

**Question 18:**

If one root of the equations is 1, find the value of a.

(a)

(b)

(c)

(d)

**Answer:**

(b)

**Question 19:**

Find k for which the quadratic equation has equal root.

(a)

(b)

(c)

(d)

**Answer:**

(c)

**Question 20:**

Determine the nature of the roots of the quadratic equation

**Answer:**

**Question 21:**

Find the discriminant of the equation

**Answer:**

Here,