Question

(0,4x - 1,3)^2 = 5,29

giúp me với ai nhanh thì mk sẽ tk cho 3 tk đó

Answer 1

\(\left(0,4x-1,3\right)^2=5,29\)

\(\left(0,4x-1,3\right)^2=\left(\pm2,3\right)^2\)

+) 0,4x - 1,3 = 2,3

0,4x = 3,6

x = 9

+) 0,4x - 1,3 = -2,3

0,4x = -1

x = -2,5

Vậy,........

Answer 2

(0,4x - 1,3)² = 5,29

(0,4x - 1,3)² = 2,3²

=> \(\orbr{\begin{cases}0,4x-1,3=2,3\\0,4x-1,3=-2,3\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}0,4x=3,6\\0,4x=-1\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=9\\x=-\frac{5}{2}\end{cases}}\)

Answer 3

\(\left(0,4x-1,3\right)^2=5,29\)

Ta xét 2th:

Th1: \(0,4x-1,3=\sqrt{5,29}\)

\(0,4x-1,3=\sqrt{5,29}+1,3\)

=> x = 9

Th2: \(0,4x-1,3=-\sqrt{5,29}\)

\(0,4x-1,3=-\sqrt{5,29}+1,3\)

=> x = -2,5

\(\Rightarrow\orbr{\begin{cases}x=9\\x=-2,5\end{cases}}\)