If 7 * 2 = 98 and 9 * 3 = 243, then 5 * 4 = ?

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Accepted Answer

1. **Find the rule.** Note the pattern: $a*b = a^2 	imes b$.
2. **Check with first:** $7*2 = 7^2 	imes 2 = 49 	imes 2 = 98$.
3. **Check with second:** $9*3 = 9^2 	imes 3 = 81 	imes 3 = 243$.
4. **Apply to given:** $5*4 = 5^2 	imes 4 = 25 	imes 4 = 100$.
FINAL_ANSWER: a

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