(x + 1)² = 2 (x - 3)
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Expand brackets: x² + 2x + 1 = 2x - 6
Put everything on one side: x² + 7 = 0
This isn't strictly a quadratic equation, because for an equation to be quadratic, it has to have 4 parts, which are defined by: ax² + bx + c = 0, where a, b & c are numbers.
Rearrange: x² = 7
Solution: x = +√7
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