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• Quadratic Equation Questions for Bank PO
• Quadratic Equation Problems for Bank PO

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Quadratic equation is an important topic and frequently appears in various competitive exams. A Quadratic equation is written in the form of ax2 + bx + c = 0. In this case, a, b and c are constants, x is a variable and the value of ‘a’ cannot be zero. The presence of x2 in the equation makes it quadratic else it will be called a linear equation.

The number of questions asked from this topic range from 3 to 5. The exams where it is asked frequently include SBI PO, IBPS PO, IBPS RRB, IBPS Clerk, SBI Clerk, NIACL, LIC AAO etc. Therefore, candidates need to practice enough number of questions to develop an understanding of the topic.

### Quadratic Equation PDF Set 2

Quadratic equation can often be tricky and is generally where candidates make silly mistakes. Most questions from the topic are asked in the first phase of the exam and are also helpful in various other word problems which can be solved by forming equations.

## Solve Quadratic Equation Questions by Factorisation

Quadratic equations can be solved by using more than one method. In this section, you will learn how to factorise quadratic equations and to find its roots. It would be helpful if you keep in mind that to factorise quadratic polynomials, you need to split the middle term. You also should remember that to determine the roots, you need to factorise the equation into linear factors and then equate each factor to zero. After solving the quadratic equation and finding its roots, you must verify that these the roots of the equation are given.

## Solve Quadratic Equation Questions by Methods of Square

To solve a quadratic equation and find its roots, under this method, the equation ax2 + bx + c = 0 is converted into the form of (x + a)2 – b2 = 0. Then, you have to apply your knowledge of square and square roots to solve the equation. Hence, the method is known as the method of completing the square. The terms which contain x is completely inside a square and the roots were found via taking the square roots.

## The Nature of Roots

A quadratic equation ax2 + bx + c = 0 has

1) Two distinct real roots, when b2 – 4ac > 0.

2) Two equal real roots, when b2 – 4ac = 0.

3) No real roots, when b2 – 4ac < 0.

A clear grasp of this concept will help you to understand more about the nature of the roots.

## Tips to solve Quadratic Equation Questions

The first step is to note down five sums related to the quadratic equation on a page. Then try to solve five sums using a basic formula. Solve these sums using a stopwatch for better time management. The next step is to evaluate the time taken and then analyse your performance.

The try solving the questions by applying shortcut tricks and note down the time carefully. It will surely make a difference from the time when you solved the first set of questions. Practice is the key to master these questions, so attempt the questions consistently.

The basic equation is ax2+bx+c=0 where this equation is equal to zero and a,b,c are constants. The quadratic equation holds the power of x where x is known as a non-negative integer.

For example:

In this question two equations (I) and (II) are given. You have to solve both the equations and give answer.

I. 8x2 – 22x + 12 = 0
II. 15y2 – 19y + 6 = 0

A. if x > y
B. if x ≤ y
C. if x ≥ y
D. if x < y
E. if x = y or relationship between x and y can't be established

Ans. A

I. 8x2 – 22x + 12 = 0

⇒ 8x2 – 16x – 6x + 12 = 0

⇒ 8x (x – 2) – 6 (x – 2) = 0

⇒ (8x – 6) (x – 2) = 0

 ⇒ x = 6 = 3/4, 2 8

II. 15y2 – 19y + 6 = 0

⇒ 15y2 – 10y – 9y + 6 = 0

⇒ 5y (3y – 2) – 3 (3y – 2) = 0

⇒ (5y – 3) (3y – 2) = 0

 ⇒ y = 3 . 2 5 3

While comparing the root values of x and y, we find that both the values of x are greater than y's.

Hence, option A is correct.