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Solve x^2 - 9 = 0

Worked through step by step. More quadratics.

Answer
x=3,x=−3\boxed{x = 3, x = -3}

Checking the result, substituting x=3x = 3 or x=−3x = -3 back into the original equation gives (±3)2−9=9−9=0(\pm 3)^2 - 9 = 9 - 9 = 0, which is correct.

Problem: Solve the quadratic equation x2−9=0x^2 - 9 = 0.

Steps

  1. Add 9 to both sides
    x2=9x^2 = 9
  2. Take the square root of both sides
    x=±9x = \pm\sqrt{9}
  3. Simplify the radical
    x=±3x = \pm 3

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