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12 cards from this deck
Magnitude of a number; distance from origin
Always positive
xxx
−x-x−x
333
d=±5d = \pm 5d=±5
Set d=±5d = \pm 5d=±5 (both positive and negative)
Square both sides
Squaring always gives positive value
x=1x = 1x=1 and x=13x = \frac{1}{3}x=31
Set 2x−1=±x2x-1 = \pm x2x−1=±x and solve both cases
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