Important points Chapter 4 book 1

If an expression is true for all the values of the variables involved then it is called identity.

If an expression is true for some values of the variables then it is called equation.

2^nd degree equation is known as quadratic equation.

Roots of the equation will always satisfy the equation.

Graph of the quadratic equation is parabola.

Number of roots is equal to the degree of the equation.

If an equation has imaginary roots then its roots will be conjugate of each other.

Exponential equation→If variable is in power or exponent.

Reciprocal equation → If x is changed by 1/x then the result will remains the same.

Radical equation → an equation having the sign of square root.

Extraneous roots → roots which do not satisfy the original equation.