How to solve a quadratic equation by completing the square .

What is a quadratic equation ?
Answer:- An equation which contains only one variable and the degree of variable is 2 is known as a quadratic equation. e.g; x² - x - 6 = 0 is a quadratic equation of one variable x. Quadratic equations are of two types :-
(i) Pure quadratic equations :-Examples,
(a) 2x² - 18 = 0
(b) y² - 64 = 0
(ii) Impure or mixed quadratic equations:-
Examples, (a) 3x² - 4x -7 =0
(b) y² + 6y + 5 = 0

***what is standard quadratic equation?

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