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(2x +1)² -(4x + 5)²=0
wzor: a²-b²=(a+b)(a-b)
(2x+1+4x+5)(2x+1-4x-5)=0
(6x+6)*(-2x-4)=0
6x+6=0 lub -2x-4=0
x=-1 lub x=-2
II sposob:
4x²+4x+1=16x²+40x+25
12x²+36x+24=0 /:12
x²+3x+2=0
x²+x+2x+2=0
x(x+1)+2(x+1)=0
(x+1)(x+2)=0
x=-1 v x=-2