Problemx2−25=0x^2 - 25 = 0x2−25=0Step-by-step solution辨識為 a=xa = xa=x、b=5b = 5b=5 的平方差。套用 a2−b2=(a−b)(a+b)a^2 - b^2 = (a-b)(a+b)a2−b2=(a−b)(a+b)：(x−5)(x+5)=0(x - 5)(x + 5) = 0(x−5)(x+5)=0。令每個因式為零：x=5x = 5x=5 或 x=−5x = -5x=−5。Answerx=5orx=−5x = 5 \quad \text{or} \quad x = -5x=5orx=−5Want to solve a different problem? Open the quadratic solver →Related worked examples/solve/algebra/x2-minus-9/solve/algebra/3x2-minus-12-equals-0