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Chapter 2: Q21. (page 87)

Solve the equation using mental math.

x-8=20

Short Answer

Expert verified

The solution of the equation is x = 28

Step by step solution

01

Apply the concept of equation: 

An equation is a mathematical statement that two expressions are equal. The solution of an equation is the value that when substituted for the variable makes the equation a true statement.

Example: 3x + 5 = 14 is an equation, in which 3x+5 and 14 are two expressions separated by an 鈥樷�檈qual鈥欌�� sign.

02

What are the steps to solve an equation? 

Step 1: Simplify each side of the equation by removing parenthesis and combining the like terms.

Step 2: Use addition or subtraction to isolate the variable term on one side (preferably in the left side).

Step 3: Use Multiplication or Division to solve for the variable.

03

Step 3: Solve the equation using mental math. x-8=20

Now solving the equation x-8=20with proper steps

x鈭�8=20x鈭�8+8=20+8[Add8tobothsides]x=28

Solution of the equation isx=28

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