explain the important notes of algebraic expressions chapter class 7th if u will answer I will mark u as Brainliest. And plz explain everything
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Answer:
The algebraic expressions have the variables and the constants. The algebraic expressions are the finite combination of the symbols that are formed according to the rules of the context. In other words, an algebraic expression is the combination of constants and variables which are interrelated with the help of algebraic operators. The algebra is an expression which is used to designate the value for the given values in the expression. The expression might be depending on the values assigned to the values assigned in the expression
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Answer:
Algebraic expressions are expressions formed from the variables and the constants. A variable can take any value. The value of an expression changes with the value chosen for variables it contains.
A number line has infinite number of points. A variable can take position on number line.
Expressions containing one, two or three terms are called monomial, binomial and trinomial respectively.
Any expression having one or more terms is called polynomial.
A monomial is obtained on multiplying any monomial with another monomial.
The numerical factor of a term is called its coefficient.
An identity is a standard equality which is true for all the values of the variables in the equality.
Few commonly used identities are
I. (a + b)2 = a2 + b2 + 2ab
II. (a – b)2 = a2 + b2 – 2ab
III. (a + b)(a – b) =a2 – b2
IV. (x + a)(x + b) = x2 + (a+b)x + ab
Note – Mainly the above formulas are used to solve all the problems of this chapter.
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