Set up a determinant:
| i j
k | | 5 0 3 |
| 7 7 9 |
calculate the determinant, using the first row as your cofactors:
(0 - 21)i - (45
- 21)j + (35 - 0)k = -21i - 24j + 35k
cross product is the vector -21i + 24j
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