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Solve [tex]m - 2(m - 4) \leq 3m[/tex] for [tex]m[/tex].

A. [tex]m \leq -2[/tex]
B. [tex]m \geq 2[/tex]
C. [tex]m \leq 2[/tex]
D. [tex]m \geq -2[/tex]


Sagot :

To solve the inequality [tex]\( m - 2(m - 4) \leq 3m \)[/tex], follow these steps:

1. Expand and simplify the left-hand side: Distribute the [tex]\(-2\)[/tex] inside the parentheses:
[tex]\[ m - 2(m - 4) = m - 2m + 8 \][/tex]
Simplify the expression:
[tex]\[ m - 2m + 8 = -m + 8 \][/tex]

2. Write the inequality: Substitute the simplified expression back into the inequality:
[tex]\[ -m + 8 \leq 3m \][/tex]

3. Isolate the variable [tex]\(m\)[/tex]: To do this, add [tex]\(m\)[/tex] to both sides of the inequality in order to get all [tex]\(m\)[/tex] terms on one side:
[tex]\[ -m + m + 8 \leq 3m + m \][/tex]
Simplify:
[tex]\[ 8 \leq 4m \][/tex]

4. Solve for [tex]\(m\)[/tex]: Divide both sides of the inequality by 4 to isolate [tex]\(m\)[/tex]:
[tex]\[ \frac{8}{4} \leq \frac{4m}{4} \][/tex]
Simplify:
[tex]\[ 2 \leq m \][/tex]
This can be rewritten as:
[tex]\[ m \geq 2 \][/tex]

So, the solution to the inequality [tex]\( m - 2(m - 4) \leq 3m \)[/tex] is:
[tex]\[ m \geq 2 \][/tex]