A polynomial of second degree is generally called a quadratic polynomial.

If f(x) is a quadratic polynomial, then f(x) = 0 is called a quadratic equation.

An equation in one unknown quantity in the form ax$$^{2}$$ + bx + c = 0 is called quadratic equation.

A quadratic equation is an equation of the second degree.

The general form of a quadratic equation is ax$$^{2}$$ + bx + c = 0 where a, b, c are real numbers (constants) and a ≠ 0, while b and c may be zero.

Here, x is the variable, a is called the coefficient of x$$^{2}$$, b the coefficient of x and c the constant (or absolute) term.

The values of x which satisfy the equation are called the roots of the quadratic equation.

(i) 5x$$^{2}$$ + 3x + 2 = 0 is an quadratic equation.

Here, a = the coefficient of x$$^{2}$$ = 5,

b = coefficient of x = 3 and

c = constant = 2

(ii) 2m$$^{2}$$ - 5 = 0 is an quadratic equation.

Here, a = the coefficient of m$$^{2}$$ = 2,

b = coefficient of m = 0 and

c = constant = -5

(iii) (x - 2)(x - 1) = 0 is an quadratic equation.

(x - 2)(x - 1) = 0

⇒ x$$^{2}$$ - 3x + 2 = 0

Here, a = the coefficient of x$$^{2}$$ = 1,

b = coefficient of x = -3 and

c = constant = 2

(iv) x$$^{2}$$ = 1 is an quadratic equation.

x$$^{2}$$ = 1

⇒ x$$^{2}$$ - 1 = 0

Here, a = the coefficient of x$$^{2}$$ = 1,

b = coefficient of x = 0 and

c = constant = -1

(v) p$$^{2}$$ - 4p + 4 = 0 is an quadratic equation.

Here, a = the coefficient of p$$^{2}$$ = 1,

b = coefficient of p = -4 and

c = constant = 4

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