algebra

Quadratic equation whose roots are 5 and -5 with coefficient 3
using the letter x to represent the variable

please show steps

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asked by tbell
  1. What did you get ?

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    posted by Reiny
  2. 3(x-5) (x+5)= 3x^2-28x + 75

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    posted by tbell
  3. Your expansion is incorrect

    3(x-5)(x+5)
    = 3(x^2 - 25)
    = 3x^2 - 75

    Since you wanted a quadratic equation, it should be

    3x^2 - 75 = 0

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    posted by Reiny

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