Class X Mathematics Chapter 4 Quadratic Equations by pyb17727

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                                Class X: Mathematics
                            Chapter 4: Quadratic Equations

                                    Top Formulae

                                                 −b + b2 − 4ac          −b − b2 − 4ac
1. Roots of ax 2 + bx + c = 0, a ≠ 0 are                         and                    ,
                                                      2a                     2a
   where     b2 − 4ac > 0
                                           −b     b
2. Roots of ax 2 + bx + c = 0, a ≠ 0 are      and          ,where      b2 − 4ac = 0
                                           2a     2a
3. Quadratic identities:

       i. (a + b)2 = a2 + 2ab + b2
       ii. (a - b)2 = a2 - 2ab + b2
       iii. a2 - b2 = (a + b) ( a – b)

4. Discriminant, D = b2 - 4ac




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