<PRE><B>Question 704755</B>
1+3a=10a^2
10A^2-3A-1=0
(5A+1)(2A-1)=0
5A+1=0
5A=-1
A=-1/5 ANS.
2A-1=0
2A=1 
A=1/2 ANS.
PROOF:
1+3(-1/5)=10(-1/5)^2
1-3/5=10*1/25
2/5=10/25
2/5=2/5
1+3(1/2)=10(1/2)^2
1+3/2=10*1/4
2 1/2=10/4
2.5=2.5</PRE>