Evaluate $3x^2+5x-1$ if $x=7$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Evaluate $3x^2+5x-1$ if $x=7$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
181
Evaluate $3x^2+5x-1$ if $x=7$.
train