Rearrange formulas to highlight a chosen quantity across the expression types studied.
Identify restrictions introduced or exposed by a rearranged formula
Problem
What restrictions are introduced when this formula is rearranged? \(x=A/(y+z)\)
Big Picture
What this problem is really about
Look at the rearranged formula for any operation that can fail. Here division is by an entire sum, so that sum—not the numerator, output, or each addend separately—must be nonzero. Expressing the forbidden relation can help check the restriction precisely, especially when two nonzero addends might cancel each other.
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