Question

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Answer 1

factor, difference of 2 squares
(x-9)(x+9)=0

Answer 2

\[x=\pm9\]

Answer 3

pellet, which one is it? lol

Answer 4

Two answers.It is a quadratic equation

Answer 5

Both answers given are the same, just expressed in different ways:
On the left hand side:(x-9)(x+9)
On the right hand side: 0
To get 0 on the right, at least one of the numbers on the left must be 0
Either x - 9 = 0, so that x = 9 or x+9 = 0 so that x = -9
In a quadratic equation, when x^2 is part of the equation, you get 2 values for x