Solve x^2-81=0

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Solve a quadratic equation be either the difference of squares or by solving directly.
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So you mean 9 multiply by 9 is equal to 81, i get it a little but the other cant understand it... Please explain to us ..
(x + 9)(x - 9)
X mutiply it to the other X and it will be x² while positive 9 multiply it in negative 9 and the answer is maybe positive or negative 81.. am i right sir?...

mayeattwenty
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Ajudou muito, mesmo sendo em outro idioma, obrigada ❤️

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