College Math Placement Practice Test

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Prepare for your College Math Placement Test with our expert-crafted quiz! Practice with diverse question formats and detailed explanations to enhance your math skills and boost your confidence.

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What is the value of x in the equation 3(x + 2) = 21?

x = 3
x = 4
x = 5
x = 6

The correct answer is: x = 5

To find the value of x in the equation 3(x + 2) = 21, we can start by isolating the variable step by step. First, divide both sides of the equation by 3 to simplify it. This gives us: x + 2 = 7 Next, we subtract 2 from both sides to further isolate x: x = 7 - 2 This simplifies to: x = 5 Thus, the correct answer is x = 5. This approach involves using basic algebraic principles such as distributing and the operations of addition and subtraction to manipulate the equation until we get to the solution for x.