Advanced Math practice question

Answer: 3439

(10² − 9²)(10² + 9²) = 10⁴ − 9⁴ = 10,000 − 6,561 = 3,439. (Or 19 × 181.)

Common wrong answers

If you answered 361

361 is 19², squaring the first factor.

If you answered 3419

3,419 is an arithmetic slip in 19 × 181.

If you answered 16561

16,561 adds the fourth powers instead of subtracting.

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