Multiple Choice Question (MCQ)

If (x + 1)^2 − (x − 1)^2 = 32, what is the value of x ?

  1. ×

    4

  2. ×

    6

  3. 8

  4. ×

    10

  5. ×

    12

Collected in the board: Linear Equations

Steven Zheng posted 7 hours ago

Answer

  1. Given

    (x + 1)^2 − (x − 1)^2 = 32

    Using the difference of squares formula to simplify the left hand side

    2x\cdot 2 =32

    It turns out the equation is a linear equation. Solving for x gives

    x = 8

    Therefore, C is correct


Steven Zheng posted 7 hours ago

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