\(1,\\ a,\Rightarrow x\left(2x+1\right)=0\Rightarrow\left[{}\begin{matrix}x=0\\x=-\dfrac{1}{2}\end{matrix}\right.\\ b,\Rightarrow2x^2-10x-3x-2x^2=26\\ \Rightarrow-13x=26\\ \Rightarrow x=-2\\ 2,=34^2+2\cdot16\cdot34+16^2=\left(34+16\right)^2=50^2=2500\)