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30 January, 14:00

Make a question similar to the one below:

for example:

Solve this quadratic equation: x^2 = 81

and then solve it and explain how you did it.

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Answers (1)
  1. 30 January, 14:25
    0
    two solutions : 9; - 9

    Step-by-step explanation:

    x²=81

    means : x² - 81 = 0 but 81 = 9²

    use identity; a² - b² = (a-b) (a+b)

    x² - 9² = 0 : (x-9) (x+9) = 0

    x-9=0 or x+9 = 0

    x = 9 or x = - 9
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