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Δ=b²-4ac=1-4*4/9*9/16=1-1=0
x0=-b/2a=1:2*4/9=1*9/8=9/8
x³+10x²+25x=0
x(x²+10x+25)=0
Δ=100-100=0
x=0 ∨ x=-10/2=-5
c]
0=3x²-12x
3x(x-4)=0
x=0 ∨x=4
d]
16x²-1=0
(4x+1)(4x-1)=0
x=-1/4 ∨ x=1/4