Question

define quadratic equation , solve x^2-9=0

Answer 1

${x}^{2} - 9 = 0 \\ {x}^{2} - {3}^{2} = 0 \\ (x + 3)(x - 3) = 0 \\ if (x + 3) = 0 \\ then \: x = - 3 \\ if \: (x - 3) = 0 \\ then \: x = 3$

Answer 2

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