Question

points
Mathematics
Chapters-( Algebraic expressions)
1. Answer the questions (52=10)
1.Solve: 100x2y4 and 5x10y9.
2. Classify the following pair of algebraic
terms into terms and unlike terms.
A) 2ab,-2ab
B) Zab,-3b2
3.Write the degree of the following algebraic
expressions.
А) Зxyz+3xyz- Хz -200.
B)4y® +16x?y2+3xy.
4.solve the following:
A) c2+c+c.
B)x+x-1.
5. Subtract the following algebraic
expressions by horizontal method.
A) 7k from -6k.
B) Take away -2x from 19%.
6. Find the product of 7xy and 5yz.
ILAnswer the following . 2x5=10
1) 2-10(x-b) when x=8 and b=3.
2) Subtract the sum of (a 2 - 3a) and 7 from
the sum of 3a2 and 2a-2
3) Add: 15abc-7+25c2 and 16a2+9abc-12c2​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

Mathematics NCERT Grade 7, Chapter 12: Algebraic Expressions- The chapters discuss concepts related to algebraic expressions.

After a short introduction, the first section discusses How are expressions formed?

Algebraic expressions are formed from variables and constants.

This is followed by the topics terms, factors, and coefficients.

Expressions are made up of terms.

A term is a product of factors.

Coefficient is the numerical factor in the term

Before moving to terms like monomials, binomials, and polynomials, like and unlike terms are discussed.

When terms have the same algebraic factors, they are like terms.

When terms have different algebraic factors, they are unlike terms.

Any expression with one or more terms is called a polynomial.

A one-term expression is called a monomial.

A two-term expression is called binomial.

An expression that contains three terms is called a trinomial.

Emphasis is given to important topics like the Addition and Subtraction of Algebraic Expressions.

2 sub parts are discussed in the following section:

Adding and subtracting like terms: The sum of two or more like terms is a like term with a numerical coefficient equal to the sum of the numerical coefficients of all the like terms.

The difference between two like terms is a like term with a numerical coefficient equal to the difference between the numerical coefficients of the two like terms.

Adding and subtracting general algebraic expressions

The like terms are added together while the unlike terms are left as they are.

The next part of the section explains about Finding the Value of an Expression where value of a variable is given depending on which value of the expression is calculated.

This is followed by the topic- Using Algebraic Expressions- Formulas and Rules where one understands how algebraic expressions can be used to write formulas and patterns. These patterns are related to numbers and geometrical patterns.

Perimeter formulas

Area formulas

Rules for number patterns

Some more number patterns

Pattern in geometry

Unsolved, solved exercises, questions in different patterns will make the chapter more