( )(5a+1)=1-25a²

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( )(5a+1)=1-25a²
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( )(5a+1)=1-25a²
( )(5a+1)=1-25a²

( )(5a+1)=1-25a²
(1-5a)(1+5a)=1-25a²

5a+1=1-25a²
25a²+5a=0
5a（5a+1）=0
5a=0
a=0
5a+1=0
5a=-1
a=-1/5
∴a=0、-1/5