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10 cards from this deck
Non-negative value of any real number
∣x∣|x|∣x∣
xxx if x≥0x \geq 0x≥0; −x-x−x if x<0x < 0x<0
Consider different cases based on definition
x=4x = 4x=4 or x=−4x = -4x=−4
Modulus removes any negative sign
x=4x = 4x=4
x=−1x = -1x=−1
x=−4x = -4x=−4
Validity of solutions in original equation and case conditions
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