medium · Act math
A 3 × 3 determinant is being solved using expansion along the first row: det beginbmatrix a & b & c d & e & f g & h & i endbmatrix = a(ei - fh) - b(X) + c(dh - eg).
What is the missing expression X?
- Dh - eg
- Ei - fh
- Di + fg
- Di - fg
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