Advanced MathMediumProduct of conjugate surds
Advanced Math practice question
What is the value of (2 + √3)(2 − √3)?
Answer: 1
This is a difference of squares: 2² − (√3)² = 4 − 3 = 1.
Common wrong answers
- If you answered 4
- 4 forgets to subtract (√3)².
- If you answered 7
- 7 adds 4 and 3 instead of subtracting.
- If you answered -1
- −1 reverses the subtraction.
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