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algebra · worked example

Solve 4x² - 9 = 0 — x = 3/2 or x = -3/2

Method: 平方差. Verified step-by-step solution with our free AI math solver.
Problem

4x2−9=04x^2 - 9 = 0

Step-by-step solution

  1. 辨認為平方差:4x2=(2x)24x^2 = (2x)^2 且 9=329 = 3^2。

  2. 因式分解:(2x−3)(2x+3)=0(2x - 3)(2x + 3) = 0。

  3. 令每個因式為零:2x−3=02x - 3 = 0 或 2x+3=02x + 3 = 0。

  4. 求解:x=32x = \tfrac{3}{2} 或 x=−32x = -\tfrac{3}{2}。

Answer

x=32orx=−32x = \tfrac{3}{2} \quad \text{or} \quad x = -\tfrac{3}{2}

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