Answer:
6 units =
Step-by-step explanation:
= 3 +
[3 + ] = 54 ↷
² + 3 - 54 ↷
[x - 6][x + 9] = 0
↑
We want this expression because when we talk about dimensions, we want NON-NEGATIVE numbers. The other expression gives us a solution of -9 = x, and we do not want that; this one gives us 6 = x, and THIS is what we are looking for.
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