Question

(x-2).(x-2)=36-4.5. Tìm x

Answer 1

x-2²=36-20=16

16=4²

suy ra x-2=4

x=4+2=6

Answer 2

( x - 2 ) . ( x - 2 ) = 36 - 4 . 5

( x - 2 ) . ( x - 2 ) = 36 - 20

( x - 2 ) . ( x - 2 ) = 16

x . ( 2 + 2 ) = 16

x . 4 = 16

     x = 16 : 4

     x = 4

Answer 3

( x -2 ) . ( x -  2 ) = 36-2. 5

x²-2x - 2x + 4 = 16

x²-4x = 12

x ( x - 4 ) = 12

th1 : x = 12

th2 : 

x - 4= 12

x = 16