A combination of constants and variables connected by some or all at the four fundamental operations, additions, subtraction, multiplication & division is called an algebraic expression
e.g- 3x + zy
Terms:- the different parts of an algebraic expression separated by sign+ or – are called the terms of an expression.
e.g. 3x+2y (term – 3x & 2y)
the factor of terms:- we can factorize all terms.-
e.g 3x + 2y
3x = 3×x
2y = 2×y
Types of algebraic expressions.
A Monomial– which contains only one term is said a monomial.
Ginomial– which contains two terms e.g. 3x + 2y
Trinomials– which contains three terms – e.g- 3x +2y +z
Quadrinomials – which contains four terms e.g. 2x + 3y + z-6
Polynomials– which contain one or more terms.
Degree of polynomials The highest power of the variable in a polynomial is called its degree.
Here the degree of the polynomial is 3
Linear polynomial– a polynomial of degree is called a linear polynomial. E.g.- x+3
Quadratic polynomials– a polynomial of degree 2 is called quadratic polynomials.
E.g. (x+2)(x+3) = x2 + 5x + 6
Cubic polynomial– A polynomial of degree 3 is called cubic polynomials.
e.g. degree of the term- 3x =1
2xy = 1+1 = 2
3x2g = 2 = 1 = 3
Algebraic expressions contains one or more forms and each terms contain variable and numerical coefficient, we find the value of terms to put the value of variables.
Equation– a statement of equality which invader one or more variable is called an equation. Terms of left hand side is equal to right hand side e.g – 3x+5 = 8
Solution of an equation e.g. 3x+5=8
(1 )Trial & error method– put the value of variable x, so that L.H.S= R.H.S.
Put the value of x= 1,2,3 who satisfy by the equation
3(1)=5 =8 the value of x= 1 is satisfied equation
(2) (A) if same number or terms is added, substract multiply or divide to both side of equation , the equation remain same (elemination method)
3x=3(deduct 5 in both side)
X=1 (divid from 3 in both side)
(B) change in the side of required terms.
x = 3/3 = 1