Quadratic Equations For Bank Exam

Quadratic equation is one such topic which is asked in almost all the banking exams. Approximately five questions are asked from this topic which  carries 5 marks and you can easily fetch those five marks if you solve this topic with right approach. In this article, we will be telling you the correct way of solving the questions from this topic and if you want to make sure that you master this topic then readout this article.

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What is Quadratic Equation?

In quadratic equation, students are expected to find the relation between two variable given in the two equation. The related can be of Smaller to, Greater to, Greater than, Smaller than and Equal to.

Types of Quadratic Equation

Linear Equation– In this type, when a student solve the equation then he/she will only get one value for X and for Y.

for ex- 2X+3Y=5, X+2Y=6

2X+3Y=5—–(eq.1), (X+2Y=6)X2——(eq.2)

Solving these two equations, we will get

We get, X=-8 & Y= 7

Hence Y>X, this will be our final answer

Squares Equation– In this type of question, we have to find the sqaure root of the given below and we end up getting two values each for X and Y but one is negative while other is positive. The best thing about such type of questions is that the answer to such questions are always Cannot be Determined.

For e.q., X= 1600 & Y=2500

On finding their square root we will get X=+40, -40 & Y= +50, -50

Hence the answer will be Cannot be determined.

Sqaures and Sqaure root equation– In this type of question, one is sqaure while the other one is square root and we know that sqaure root always gives positive value when we solve it.

For e.g. X=1600 & Y= 2500

On solving them we will get, X= +40, -40 & Y=+50

Hence, our answer will be Y>X

Cube Cases– In this type of questions, the cube will be given and you have to answer the relation between those cubes.

For e.g. X= 1331 & Y= 729

When we solve these two equation, we will get X= 11 & Y= 9

Hence, X>Y. The trick to solve these questions is that whichsoever cube will be greater when you will solve it that cube will remain greater.

Table Method to Solve Quadratic Equation

Sign of coefficient ‘x’ Sign of coefficient ‘y’ Sign of roots
+ + –          –
+ –          +
+ +         +
+         –

This is one of the best methods to solve Quadratic Equation questions. You can answer the question without actually solving the equations.

For e.g. x2 – 7x + 10 = 0, y2 + 8y + 15 = 0

We can solve this equation without actually solving the equation. Let’s see

  • First look at the sign in equation.1 which are -, + means its roots will be +,+ as per our table.
  • Secondly, look at the other equation, we will see the signs are +, + which means that our roots will be -, -.
  • Hence X>Y as it has both the roots positive.

Different cases in Quadratic Equations

CASES Roots of Eq.1 Roots of Eq. 2 Conclusion
CASE-2 +, + +, + Easy
CASE-3 +, + -, – Eq 1>Eq 2
CASE-4 +, – +, – Cannot be defined
CASE-5 -, – -, – Easy
CASE-6 -, – +,+ Eq1< Eq2
CASE-7 +, – +,+ Solve the Equations

Frequently Asked Questions:

Q. How many questions from this topic are asked in Banking exams?

Ans. Approximately five questions are asked in Banking exams.

Q. How many marks does this topic carry?

Ans. Usually five marks are allocated for this topic.

Q. Which is the easiest method to solve Quadratic Equation?

Ans. Table Method is the easiest method to solve Quadratic Equation.

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