Question

( x - 8 )\(^2\)  = 225

Answer 1

(x-8)²=225

=>x-8=15 hoặc x-8=-15

=> x= 15+8 hoặc x= -15+8

=> x= 23 hoặc x=7

Answer 2

\(\left(x-8\right)^2=225\)

\(\left(x-8\right)^2=15^2=\left(-15\right)^2\)

\(\Rightarrow\hept{\begin{cases}x-8=15\\x-8=-15\end{cases}\Rightarrow\hept{\begin{cases}x=23\\x=-7\end{cases}}}\)

Answer 3

(x - 8)^2 = 225

(x - 8)^2 = 15^2

=> x - 8 = 15

     x       = 15 + 8

     x       = 23.

Answer 4

(x-8)\(^2\) =225

<=> x-8=15

<=>x=15+8

<=>x=23

Answer 5

(x-8)² = 225

=> x² - 8² = 225

=> x² = 225 + 64 = 289

=> X =\(\sqrt{289}\)= 17 

TÍC MÌNH NHA!

Answer 6

TH2 : (x - 8)^2 = (-15)^2

=>       x - 8 = -15

           x       = -15 + 8

           x       = -7

Answer 7

Ta có:

\(\left(x-8\right)^2=225\)Vì \(225=15^2;225=\left(-15\right)^2\)

\(TH_1:x-8=15\)\(\Rightarrow x=15-8\Rightarrow x=7\)

\(TH_2:x-8=-15\)\(\Rightarrow x=-15-8\Rightarrow x=-23\)

Vậy \(x\in\left\{7;-23\right\}\)

Answer 8

( x-8 ) ^2=225

suy ra x-8=15

suy ra x=23