SaiBook.us Algebra

Home Course Section

Register Enroll

Step-3

Title: Module of the variable

Grade: 8-a Lesson: S2-L8

Explanation: Hello Students, time to practice and review the steps for the problem.

Lesson Steps

Step	Type	Explanation	Answer
1	Problem	Solve the equation \$ \| x - 4\| = 4 \$
2	Step	By using formula	\$\| x \| = a \$
3	Hint	By removing mod we get (+) (or) (-)	\$x = a (or) x = - a\$
4	Step	Here 'a' is 4	\$x - 4 = 4 (or) x - 4 = - 4 \$
5	Step	Adding "+ 4" on both sides we get	\$ x - \cancel4 + \cancel4 = 4 + 4 (or) x - \cancel4 + \cancel4 = - 4 + 4 \$
6	Step	After cancellation we get	\$x = 8 (or) x = 0\$
7		Answer	D

Step

Type

Explanation

Answer

Problem

Solve the equation
\$ | x - 4| = 4 \$

Step

By using formula

\$| x | = a \$

Hint

By removing mod we get (+) (or) (-)

\$x = a (or) x = - a\$

Step

Here 'a' is 4

\$x - 4 = 4 (or) x - 4 = - 4 \$

Step

Adding "+ 4" on both sides we get

\$ x - \cancel4 + \cancel4 = 4 + 4 (or) x - \cancel4 + \cancel4 = - 4 + 4 \$

Step

After cancellation we get

\$x = 8 (or) x = 0\$

Answer