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(5x + 7) (5x la a 2 - 4x - 1) = 0:

Răspuns :

5x+7=0
5x=-7
x1=-7/5=-1,4
5x²-4x-1==
Δ=16+20=36
x2=4-6/10=-2/10=-1/5=-0,2
x3=4+6/10=10/10=1