Question

Rezolvati ecuatile, unde x este nr real​

Answer 1

Explicație pas cu pas:

${x}^{2} = 169 = {13}^{2} \\ x = - 13 \\ x = 13$

${x}^{2} = 576 = {24}^{2} \\ x = - 24 \\ x = 24$

${x}^{2} = 441 = {21}^{2} \\ x = - 21 \\ x = 21$

$3 {x}^{2} = 1200 \\ {x}^{2} = 400 = {20}^{2} \\ x = - 20 \\ x = 20$

$- 7 {x}^{2} = - 252$

${x}^{2} = 36 = {6}^{2} \\ x = - 6 \\ x = 6$

$12 {x}^{2} = 300 \\ {x}^{2} = 25 = {5}^{2} \\ x = - 5 \\ x = 5$

$- 15 {x}^{2} = - 540 \\ {x}^{2} = 36 = {6}^{2} \\ x = - 6 \\ x = 6$

$20 {x}^{2} = 980 \\ {x}^{2} = 49 = {7}^{2} \\ x = - 7 \\ x = 7$

$21{x}^{2} = 756 \\ {x}^{2} = 36 = {6}^{2} \\ x = - 6 \\ x = 6$

Answer 2

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