Question

tim x biet:

2x²-1=17

Answer 1

2x²-1=17

2x²=18

x²=9

=> x=3

Vậy x = 3

Answer 2

\(y=\frac{1}{x^2+\sqrt{x}}\)

Answer 3

2x^2-1=17

2x^2=18

x^2=9

x=3 ;x=-3

Answer 4

=> 2x² = 18

=> x² = 18 : 2 = 9

=> x = 3 hoặc -3

Answer 5

2x² -1 = 17

2x²     = 17+1

2x²     = 18

x²      = 18 : 2 

x²        = 9

=> x²    = 3² 

vậy x = 3