NCERT Notes for Class 10 Maths Chapter 4 Quadratic Equations
Class 10 Maths Chapter 4 Quadratic Equations Notes
Chapter Name  Quadratic Equations Notes 
Class  CBSE Class 10 
Textbook Name  NCERT Mathematics Class 10 
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A quadratic polynomial of the form ax² + bx + c, where a ≠ 0 and a, b, c are real numbers, is called a quadratic equation
when ax² + bx + c = 0.
Here, a and b are the coefficients of x² and x respectively and ‘c’ is a constant term.
Any value is a solution of a quadratic equation if and only if it satisfies the quadratic equation.
Quadratic formula
The roots, i.e., Î± and Î² of a quadratic equation ax² + bx + c = 0 are given by
provided b² – 4ac ≥ 0.
Here, the value b² – 4ac is known as the discriminant and is generally denoted by D. ‘D’ helps us to determine the nature of roots for a given quadratic equation. Thus, D = b² – 4ac.
The rules are:
 If D = 0 ⇒ The roots are Real and Equal.
 If D > 0 ⇒ The two roots are Real and Unequal.
 If D < 0 ⇒ No Real roots exist.
If Î± and Î² are the roots of the quadratic equation, then Quadratic equation is x² – (Î± + Î²) × + Î±Î² = 0 Or x² – (sum of roots) x + product of roots = 0