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5x² + 6√5x + 8=0
5√5x² + 30x + 8√5=0
5√5x² + 20x + 10x + 8√5=0
5√5x² + 4 × 5x + (2√5 ) × √5 x + 2√5 × 4=0
5x ( √5x + 4 ) + ( 2√5 ) [ √5x + 4 ]=0
( √5x + 4 ) ( 5x + 2√5 )=0
x = -4/√5 or x= -2/5√5