(7-✓2)(7+√2)= ?
Maths / Algebra MCQs — Multiple-choice practice
- A. 47
- B. 49
- C. 51
- D. 45
Correct answer
47
Explanation
Explanation (7 - √2)(7 + √2): Use the formula (a - b)(a + b) = a² - b² Here, a = 7 and b = √2 So, = 7² - (√2)² = 49 - 2 = 47
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