Which reason justifies step C in the following proof? Conjecture: If 3x² + 10 = 100, then z = ±√/30 3x² + 10 = 100 A given 3x² = 90 B subtraction property of equality x² = 30 C. ? 2=±√30 D square root - Qammunity

Which reason justifies step C in the following proof? Conjecture: If 3x² + 10 = 100, then z = ±√/30 3x² + 10 = 100 A given 3x² = 90 B subtraction property of equality x² = 30 C. ? 2=±√30 D square root

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