Question

x²=100
5x²=1125
-3x²=18
rezolvați in IR​

Answer 1

Răspuns:

x²=100

x= √100

x=10

5x²=1125

x²=1125:5

x²=225

x=√225

x=15

-3x²=18

x²=18: (-3)

x²= -6

x= √-6

Answer 2

Răspuns:

$x {}^{2} = 100 \\ x = \sqrt{100} = 10 \: si - 10 \\ 5 {x}^{2} = 1125 \\ {x}^{2} = 1125 \div 5 = 225 \\ x = \sqrt{225} = 15 \: si \: - 15 \\ - 3 {x}^{2} = 18 \\ {x}^{2} = 18 \div ( - 3) = - 6 \\ x {}^{2} = - 6 < 0 \\ \: deci \: x \: nu \: apartine \: \\ \: multimii \: numerelor \: reale$