Solve the Inequality: |−4 + 8| − 2|−|a| > 0

Question

Solve:

\Vert-4+8|-2|-|a|>0

Video Solution

Step-by-Step Solution

Let's solve the inequality step-by-step:

First, simplify 2 |-2| .

  • 2=2|-2| = 2, because the absolute value of a number is its distance from zero without considering the sign.

Now focus on the expression 4+8 |-4 + 8|.

  • 4+8=4-4 + 8 = 4, so 4+8=4=4|-4 + 8| = |4| = 4.

Substitute these values back into the inequality:

  • The inequality becomes 42a>0|4 - 2| - |a| > 0.

Simplify further:

  • 42=24 - 2 = 2, so 2a>0|2 - |a|| > 0.

Now we solve 2a>0|2 - |a|| > 0:

  • This inequality implies that 2a0 2 - |a| \neq 0 , meaning a2|a| \neq 2.
  • Additionally, 2a>0|2 - |a|| > 0 implies 2a>0 or 1(2a)>0 2 - |a| > 0 \text{ or } -1(2 - |a|) > 0, simplifying to a<2 |a| < 2 .

Since a<2|a| < 2 implies that 2<a<2-2 < a < 2, solve for a a:

2<a<2-2 < a < 2

Thus, the solution set is:

2>a>2 2 > a > -2

Answer

2>a>-2