Question

Calculati!
a)(-√2)la puterea a doua
b)(-√2)la puterea a treia

Answer 1

( - √2)² = ( -√2) ·( -√2 ) = √4 =2 
( - √2)³ = ( - √2) ·( - √2) · ( -√2 ) = - √4√2 = - 2√2 

Answer 2

$a).(- \sqrt{2} )^2=(- \sqrt{2} ) \cdot (- \sqrt{2} )=2 \\ b).(- \sqrt{2} )^3=(- \sqrt{2} ) \cdot (- \sqrt{2} ) \cdot (- \sqrt{2} )=2 \cdot (- \sqrt{2} )=-2 \sqrt{2}$