factorise by spliting the middle term 3x²+8x+5
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3x²+ (5+3)x + 5 = 0
3x²+5x+3x+5 =0
x(3x+5)+1(3x+5)=0
(x+1) (3x+5)=0
when x+1=0 , x= -1
when 3x+5=0 , x= -5/3
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