# What is the value of the expression?

## What is the value of the expression?

To evaluate an algebraic expression means to find the value of the expression when the variable is replaced by a given number. To evaluate an expression, we substitute the given number for the variable in the expression and then simplify the expression using the order of operations.

How do you define a variable in an algebraic expression?

A variable is a letter representing some unknown; a variable always represents a number, but it carries varying values when written in an expression. By convention, mathematicians usually assign letters(not mandatory) at the end of the alphabet (such as x, y, and z) to be variables.

How can you use algebra to answer an expression?

√ (2x+9) – 5 = 0 First,move everything that isn’t under the radical sign to the other side of the equation:

• √ (2x+9) = 5
• Then,square both sides to remove the radical:
• (√ (2x+9)) 2 = 5 2 =
• 2x+9 = 25 Now,solve the equation as you normally would by combining the constants and isolating the variable:
• 2x = 25 – 9 =
• 2x = 16
• x = 8
• ### What is it called to find the value of an algebraic expression?

To evaluate an algebraic expression means to find the value of the expression when the variable is replaced by a given number. To evaluate an expression, we substitute the given number for the variable in the expression and then simplify the expression using the order of operations. Click to see full answer.

How do you solve algebraic expressions?

Solving algebraic word problems requires us to combine our ability to create equations and solve them. To solve an algebraic word problem: Define a variable. Write an equation using the variable. Solve the equation. If the variable is not the answer to the word problem, use the variable to calculate the answer.

How do you write an expression in Algebra?

This is pretty confusing!

• Since there are three times as many rivers as mountains,we can write the number of rivers as 3 m {\\displaystyle 3m} .
• Since there are five more islands than mountains,we can write the number of islands as m+5 {\\displaystyle m+5} .
• Finally,we want “the total number of features”.