8

Set 12: Linear Inequalities (Intermediate)

Explanation

Answer: A

Solve: 5x(x+2)3x+55x - (x + 2) \geq 3x + 5

A.

x7x \geq 7

✓ Correct
B.

x3x \geq 3

C.

x7x \leq 7

D.

x3x \leq 3

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Distribute the negative sign carefully. 1. Distribute negative: 5xx23x+55x - x - 2 \geq 3 x + 5 2. Combine terms: 4x23x+54x - 2 \geq 3 x + 5 3. Subtract 3 x: x25x - 2 \geq 5 4. Add 2: x7x \geq 7 Strategic Tip: (x+2)-(x + 2) becomes x2-x - 2. Forgetting to distribute the negative to the constant is a common error. Choice B is incorrect because it might come from adding 2 to 5 incorrectly or failing to distribute the negative. Choice C is incorrect because it reverses the inequality direction. Choice D is incorrect because it combines wrong value and wrong direction.

Key Steps:

The correct answer is x7x \geq 7

Why others are wrong:
B: Choice B is incorrect and may result from a calculation error.
C: Choice C is incorrect and may result from a calculation error.
D: Choice D is incorrect and may result from a calculation error.

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