Evaluate
5000-42n
Factor
2\left(2500-21n\right)
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0\times 2n^{2}-42n+5000
Multiply 0 and 0 to get 0.
0n^{2}-42n+5000
Multiply 0 and 2 to get 0.
0-42n+5000
Anything times zero gives zero.
5000-42n
Add 0 and 5000 to get 5000.
2\left(0-21n+2500\right)
Factor out 2.
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