Răspuns :
2(x+2)^2-11=61
2(x^2+4)-11=61
2x^2+8-11=61
2x^2-3=61
2x^2=64
×^2=32
×=radical din 32
2(x+2)²-11=61
2(x+2)²=72
(x+2)²=36
|x+2|=6
i)x+2=6⇒x=4
ii)x+2=-6⇒x=-8
S:x∈{4,-8}
2(x+2)²=72
(x+2)²=36
|x+2|=6
i)x+2=6⇒x=4
ii)x+2=-6⇒x=-8
S:x∈{4,-8}