Rezolvati ecuatile, unde x este nr real

Explicație pas cu pas:
[tex] {x}^{2} = 169 = {13}^{2} \\ x = - 13 \\ x = 13[/tex]
[tex] {x}^{2} = 576 = {24}^{2} \\ x = - 24 \\ x = 24[/tex]
[tex]{x}^{2} = 441 = {21}^{2} \\ x = - 21 \\ x = 21[/tex]
[tex]3 {x}^{2} = 1200 \\ {x}^{2} = 400 = {20}^{2} \\ x = - 20 \\ x = 20[/tex]
[tex] - 7 {x}^{2} = - 252[/tex]
[tex]{x}^{2} = 36 = {6}^{2} \\ x = - 6 \\ x = 6[/tex]
[tex]12 {x}^{2} = 300 \\ {x}^{2} = 25 = {5}^{2} \\ x = - 5 \\ x = 5[/tex]
[tex] - 15 {x}^{2} = - 540 \\ {x}^{2} = 36 = {6}^{2} \\ x = - 6 \\ x = 6[/tex]
[tex]20 {x}^{2} = 980 \\ {x}^{2} = 49 = {7}^{2} \\ x = - 7 \\ x = 7[/tex]
[tex]21{x}^{2} = 756 \\ {x}^{2} = 36 = {6}^{2} \\ x = - 6 \\ x = 6[/tex]
Răspuns:
R
Explicație pas cu pas:
a)x²=169
x1,2=±13
b)x²=576
x1,2=±24
c)x²=441
x1,2=±21
d)3x²=1200 :/3
x²=400
x1,2=±20
e)-7x²=-252 /:(-7)
x²=36
x1,2=±6
f)12x²=300 /:12
x²=25
x1,2=±5
g)-15x²=-540 /:(-15)
x²=36
x1,2=±6
h)20x²=980 /:20
x²=49
x1,2=±7
i)21x²=756 /:21
x²=36
x1,2=±6