Algebric Expressions and Inequalities:- Unknown quantities used in any equation are known as variables, generally denoted by x, y, z etc. An equation is a statement of equality of two algebraic expression, which involve one or more unknown quantities, called the variables. Linear equation involves one variable, Quadratic equation involves two variables. The graph of a linear equation is a straight line in X-Y plane. The linear equation is ax+b=c, a #o, => ax=c-b Hence the value of x = Ex-Solve 2x-7=1
- 2x = 7+1 =8 => x=4.
- ax2 +bx=-c => x2+ b⁄aX = - c⁄a => x2+x +)2= - + )2
- x =, If one root is α, other root is β.
- α2 / bf-ec = α /cd-fa =1 / ae – db , Hence two roots.