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(2x+1+4x+5)(2x+1-4x-5)=0
(6x+6)(-2x-4)=0
6x+6=0 v -2x-4=0
6c=-6 v 2x=-4
x=-1 v x=-2
4x²+4x+1 = 16x²+40x+25
4x²-16x²+4x-40x+1-25 = 0
-12x²-36x-24 = 0
a=-12
b=-36
c=-24
Δ = b²-4ac
Δ = (-36)²-4*(-12)*(-24) = 1296-1152 = 144
√Δ = √144 = 12
x1 = -b-√Δ /2a
x1 = 36-12 / -24 = 24/-24 = -1
x2 = -b+√Δ / 2a
x2 = 36+12 / -24 = 48/-24 = -2