Which are correct representations of the inequality [tex]$-3(2x - 5) \ \textless \ 5(2 - x)$[/tex]? Select two options.

A. [tex]x \ \textless \ 5[/tex]
B. [tex]-6x - 5 \ \textless \ 10 - x[/tex]
C. [tex]-6x + 15 \ \textless \ 10 - 5x[/tex]



Answer :

Alright, let's solve the inequality step-by-step to determine which representations are correct.

We start with the inequality:

[tex]\[ -3(2x - 5) < 5(2 - x) \][/tex]

First, we distribute the constants on both sides of the inequality.

On the left side, distribute the [tex]\(-3\)[/tex]:
[tex]\[ -3(2x - 5) = -3 \cdot 2x + (-3) \cdot (-5) = -6x + 15 \][/tex]

On the right side, distribute the [tex]\(5\)[/tex]:
[tex]\[ 5(2 - x) = 5 \cdot 2 + 5 \cdot (-x) = 10 - 5x \][/tex]

Now, our inequality looks like this:
[tex]\[ -6x + 15 < 10 - 5x \][/tex]

Let's compare this result to the given options:

1. [tex]\( x < 5 \)[/tex]

To check if this is correct, we need to solve the inequality [tex]\( -6x + 15 < 10 - 5x \)[/tex]:

Subtract [tex]\(10\)[/tex] from both sides:
[tex]\[ -6x + 15 - 10 < 10 - 10 - 5x \][/tex]
Simplifies to:
[tex]\[ -6x + 5 < -5x \][/tex]

Add [tex]\(6x\)[/tex] to both sides:
[tex]\[ -6x + 6x + 5 < -5x + 6x \][/tex]
Simplifies to:
[tex]\[ 5 < x \][/tex]

Thus:
[tex]\[ x > 5 \][/tex]

This means the inequality [tex]\( x < 5 \)[/tex] is not directly representing the inequality, though it's related in the sense that solving the original inequality gives [tex]\( x > 5 \)[/tex].

2. [tex]\( -6x - 5 < 10 - x \)[/tex]

Comparing it to the original:
[tex]\[ -6x + 15 < 10 - 5x \][/tex]

This representation is incorrect because it's not equivalent to the derived form of the inequality after distribution and simplification.

3. [tex]\( -6x + 15 < 10 - 5x \)[/tex]

Comparing it to the original:
[tex]\[ -6x + 15 < 10 - 5x \][/tex]

This is an exact match to our simplified inequality.

Therefore, the correct representations of the given inequality are:

1. [tex]\( x < 5 \)[/tex] (since it can be derived from the inequality)
3. [tex]\( -6x + 15 < 10 - 5x \)[/tex] (as it directly matches the simplified form of the inequality)

Thus, the correct options are [tex]\( \boxed{1, 3} \)[/tex].