Question

10+2 x |x|=2 x (3² -1)

Answer 1

\(10+2.\left|x\right|=2.\left(3^2-1\right)\)

\(10+2.\left|x\right|=2.8\)

\(2.\left|x\right|=16-10\)

\(\left|x\right|=6\div2\)

\(\left|x\right|=3\)

\(\Rightarrow x\in\left\{3;-3\right\}\)

Answer 2

10 + 2 . |x| = 2 . (3² - 1)

10 + 2 . |x| = 2 . (9 - 1)

10 + 2 . |x| = 2 . 8 =16

 2 . |x| = 16 - 10 = 6

|x| = 6 : 2 = 3

=> x = 3

hay :

     x = -3

Answer 3

=>10+2./x/=2.8

=>10+2./x/=16

=>2./x/=16-10

=>2./x/=6

vậy 2.x=6 hoặc 2.x=-6

=>x=6:2 hoặc x=-6:2

=>x=3 hoặc x=-3

vậy x={3;-3}

k mik nha