Question

Calculați :
a)
$\sqrt{17 ^{2} - 15^{2} }$

Answer 1

$a) \sqrt{ {17}^{2} - {15}^{2} } = \sqrt{289 - 225} = \sqrt{64} = 8$

Answer 2

Răspuns

√(17² - 15²) = √(17 - 15)(17 + 15) = √2·32 = √64 = √8² = 8