Question

Tìm x,biết :

     ( x - 3 )\(^2\)= 25 ( x thuộc N )

Answer 1

Ta có: \(\left(x-3\right)^2=25\)

\(\Leftrightarrow\left(x-3\right)^2=5^2\left(x\inℕ^∗\right)\)

\(\Leftrightarrow x-3=5\)

\(\Leftrightarrow x=5+3\)

\(\Leftrightarrow x=8\)

hok tốt!!

Answer 2

(x-3)² = 25

(x-3)² = 5²

x-3 = 5

x= 5+3

x=8

Answer 3

\(\left(x-3\right)^2=25\)

\(\Leftrightarrow\left(x-3\right)^2=5^2\)

\(\Leftrightarrow x-3=5\)

\(\Leftrightarrow x=5+3\)

\(\Leftrightarrow x=8\)

Vậy x = 8