Hei! :)
[tex]b) (x+2)^{2} =16\\\sqrt{(x+2)^{2}} =\sqrt{16} \\ |x+2|=4\\cazul 1: x+2=4 => x=2\\cazul 2: x+2=-4=> x=-6 \\=> S=(-6; 2)[/tex]
[tex]c) (2x-1)^{2} -81=0\\=> (2x-1)^{2} =81\\=> \sqrt{ (2x-1)^{2} } =\sqrt{81} \\|2x-1|=9\\cazul 1: 2x-1=9 => 2x=10 => x=5\\cazul2: 2x-1=-9=> 2x=-8=> x=-4\\=> S=(-4; 5)[/tex]
