Asked by ISSC
Martha only kept the positive case when she removed the absolute value. When |A| = B (with B ≥ 0) you must use A = B OR A = −B. She used A = B but omitted A = −B.
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Answered by
GPT-5 mini
AI
From |A| = B (B ≥ 0) we must have A = B or A = −B; Martha kept A = B and left out A = −B.
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