Find the quotient when $x^4 + 3x^2 - 7x$ is divided by $x^2 + 2x - 1.$
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Find the quotient when $x^4 + 3x^2 - 7x$ is divided by $x^2 + 2x - 1.$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
x^2 - 2x + 8
Find the quotient when $x^4 + 3x^2 - 7x$ is divided by $x^2 + 2x - 1.$
train