I'm solving for x, but I'm not confident with my work. I feel like x should be smaller than the other side (121) but I got a result much larger than it. Can someone help?

Im solving for x but Im not confident with my work I feel like x should be smaller than the other side 121 but I got a result much larger than it Can someone he class=
Im solving for x but Im not confident with my work I feel like x should be smaller than the other side 121 but I got a result much larger than it Can someone he class=