Question

Calculati:

a) (-6 radical 2) la puterea 2 - ( 5 radical 3) la puterea 2

b) (-3 radical 5) la puterea 2 + ( 2 radical 2 ) la puterea 2

c) ( 5 radical 3 ) la puterea 2 -(-2 radical 27) la puterea 2



AJUTOR!!!!!

Answer 1

$a) {( - 6 \sqrt{2} )}^{2} - {(5 \sqrt{3} })^{2}$
$= ( { - 6})^{2} \times 2 + ( { - 5})^{2} \times 3$
$= 36 \times 2 + 25 \times3$
$= 72 + 75$
$= 147$
$b( {- 3 \sqrt{5} })^{2} + ({2 \sqrt{2}) }^{2}$
$= ( { - 3})^{2} \times 5 + {2}^{2} \times 2$
$= 9 \times 5+ 4 \times 2$
$= 45 + 8$
$= 53$
$c) ({5 \sqrt{3} })^{2} - ({ - 2 \sqrt{27} })^{2}$
$= {5}^{2} \times 3 - ( { - 2 \times 3 \sqrt{3} })^{2}$
$= 25 \times 3 - ( { - 6 \sqrt{3} )}^{2}$
$= 75 - (36 \times 3)$
$= 75 - 108$
$= - 33$

Answer 2

a)
72 -75 = -3
B))
= 9x5+4x2= 45+8= 53
C))
25x3 -4x27= 75-108= -33