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Questions and Answers
What is the value of x in the equation 2x + 5 = 17?
What is the value of x in the equation 2x + 5 = 17?
- x = 6 (correct)
- x = 7
- x = 8
- x = 9
What is the value of y in the equation 3y - 7 = 20?
What is the value of y in the equation 3y - 7 = 20?
- y = 9
- y = 10
- y = 12
- y = 11 (correct)
Which of the following is the correct expansion of (x + 3)(x - 4)?
Which of the following is the correct expansion of (x + 3)(x - 4)?
- x^2 - x - 12
- x^2 - 7x - 12 (correct)
- x^2 - 7x + 12
- x^2 - x - 7
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Study Notes
Equations and Expansions
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To solve for x in the equation 2x + 5 = 17, subtract 5 from both sides, resulting in 2x = 12, then divide both sides by 2 to get x = 6.
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To solve for y in the equation 3y - 7 = 20, add 7 to both sides, resulting in 3y = 27, then divide both sides by 3 to get y = 9.
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The correct expansion of (x + 3)(x - 4) is x^2 - x - 12.
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