Question 123975
3x^2+bx-3=0
3x^2-8x-3=0
(3x+1)(x-3)=0 
or
3x^2-3=0
(3x-3)(x+1)=0
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5x^2+bx+1=0
5x^2+6x+1=0
(5x+1)(x+1)=0
or
5x^2-6x+1=0
(5x-1)(x-1)=0
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I'LL LEAVE THE REST FOR YOU TO SOLVE HAVING GIVEN YOU A COUPLE OF SOLUTIONS.