Question

найдите значение выражения
$\sqrt {65 {}^{2} - {56}^{2} }$
.....,.......​

Answer 1

$\sqrt{65^2-56^2} = \sqrt{(65-56)(65+56)} = \sqrt{9\cdot121} = \sqrt{9}\cdot\sqrt{121} = \sqrt{3^2}\cdot\sqrt{11^2} = 3\cdot11=33$

Answer 2

√65²-56²=√(65-56)(65+56)=√9×121=3×11=33