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Simplifying
x2 + 0x + -1 = 0
Anything times zero is zero.
x2 + 0x + -1 = 0
Reorder the terms:
0 + -1 + x2 = 0
Combine like terms: 0 + -1 = -1
-1 + x2 = 0
Solving
-1 + x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '1' to each side of the equation.
-1 + 1 + x2 = 0 + 1
Combine like terms: -1 + 1 = 0
0 + x2 = 0 + 1
x2 = 0 + 1
Combine like terms: 0 + 1 = 1
x2 = 1
Simplifying
x2 = 1
Take the square root of each side:
x = {-1, 1}
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