(7-✓2)(7+√2)= ?
- 45
- 47
- 49
- 51
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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