After The School
Class 10MathematicsChapter 4: Quadratic Equations

Key Formulas

Summary of key formulas for Quadratic Equations.

ConceptFormula
Standard Formax2+bx+c=0,  a≠0ax^2 + bx + c = 0, \; a \neq 0
Quadratic Formulax=−b±b2−4ac2ax = \dfrac{-b \pm \sqrt{b^2 - 4ac}}{2a}
DiscriminantD=b2−4acD = b^2 - 4ac
Sum of rootsα+β=−ba\alpha + \beta = -\dfrac{b}{a}
Product of rootsαβ=ca\alpha \beta = \dfrac{c}{a}

Word Problems

Solving real-world word problems using quadratic equations.

10.1 Reflection of Light

Laws of reflection and the behaviour of light when it falls on a polished surface.