Question

Define an expression with two examples​

Answer 1

In mathematics, an expression or mathematical expression is a finite combination of symbols that is well-formed according to rules that depend on the context

An expression is a sentence with a minimum of two numbers and at least one math operation. This math operation can be addition, subtraction, multiplication, and division. The structure of an expression is: Expression = (Number, Math Operator, Number)

Answer 2

Answer:

$\huge\mathfrak\blue{Expressions}$

In algebra, letters are used to stand for values that can change (variables) or for values that are not known (unknowns).

A term is a number or letter on its own, or numbers and letters multiplied together, such as - 2, 3x or 5a^2

An expression is a set of terms combined using the operations +, – , x or div, for example 4x − 3 or x^2 – xy + 17

An equation states that two expressions are equal in value, for example 4b − 2 = 6

An identity is a statement that is true no matter what values are chosen, for example \(4a \times a^2 = 4a^3

$\huge\red{Writing ..expressions}$

$\fbox\green{Example 1}$

Pens are sold in packs of 6 and rulers are sold in boxes of 10.

A teacher buys p packs of pens and r boxes of rulers. Write an expression for the total number of pens and rulers bought.

There are 6 pens in each pack, so the number of pens bought is which 6×p is 6p

There are 10 rulers in each box, so the number of rulers bought is 10×r which is 10r

The number of pens and rulers bought is

6p + 10r

$\fbox\pink{Example 2}$

A rectangle has a width of cm. The height is 3 cm less than the width. Write an expression for the perimeter of the rectangle.

Rectangle x cm long

The perimeter is found by adding together the lengths of the sides of a shape.

The width of the rectangle is given as cm. The height of the rectangle is 3 less than the width: x - 3 cm

Perimeter = x + x + (x-3) + (x-3)

Perimeter = (4x -6) cm

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