Question

16 - ( 1,5 + x )² = \(\sqrt{49}\)

Answer 1

\(16-\left(1,5+x\right)^2=\sqrt{49}\)
\(16-\left(1,5+x\right)^2=7\)
\(\left(1,5+x\right)^2=16-7\)
\(\left(1,5+x\right)^2=9\)
\(\left(1,5+x\right)^2=3^2\)
\(1,5+x=3\) hoặc \(1,5+x=-3\)
\(x=3-1,5\) hoặc \(x=-3-1,5\)
\(x=1,5\) hoặc \(x=-4,5\)

Answer 2

\(16-\left(1,5+x\right)^2=\sqrt{49}\)

\(16-\left(1,5+x\right)^2=7\)

\(\left(1,5+x\right)^2=16-7\)

\(\left(1,5+x\right)^2=9\)

\(\left(1,5+x\right)^2=3^2\)

`1,5+x=3` hoặc `1,5+x=-3`

`x=1,5` hoặc `x=-4,5`