$(x-3)^2+175=2^5.5^2_{}$
$⇔x^2-6x+9+175=32.25_{}$
$⇔x^2-6x+184=800_{}$
$⇔x^2-6x+184-800=0_{}$
$⇔x^2-6x-616=0_{}$
$⇔x^2+22x-28x-616=0_{}$
$⇔(x^2+22x)-(28x+616)=0_{}$
$⇔x.(x+22)-28.(x+22)_{}=0$
$⇔(x+22)(x-28)=0_{}$
$⇔_{}$ \(\left[ \begin{array}{l}x+22=0\\x-28=0\end{array} \right.\) $⇔_{}$ \(\left[ \begin{array}{l}x=-22\\x=28\end{array} \right.\)
$Vậy_{}$ $x_{1}=-22;$ $x_{2}=28$
$b)_{}$ $50-[ 30-(4-1)^2]_{}$
$=50-30+(4-1)^2_{}$
$=50-30+3^2_{}$
$=50-30+9_{}$
$=29_{}$
