Question

Tìm x :

\(\frac{\left(x-1\right)}{15}^2\)= \(\frac{3}{5}\)

Answer 1

<=> (x-1)² . 5 = 45

<=> (x - 1)² = 9

<=> ( x - 1)² =(+-3)²

<=> x - 1 = +-3

<=> x = 4 ; -2 (tm)

Answer 2

3/5=9/15

=>(x-1)^2=9

(x-1)^2=3^2

x-1=3

x=3+1

x=4