\left\{ \begin{array} { l } { a _ { 1 } + ( a _ { 1 } + d ) ^ { 2 } = 1 } \\ { a _ { 1 } + 2 d = 2 } \end{array} \right.
Solve for a_1, d
a_{1}=0\text{, }d=1
a_{1}=-8\text{, }d=5
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