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9x²-12x+4=49
9x²-12x+4-49=0
9x²-12x-45=0
(3x+5)(3x-9)=0
3x+5=0 3x-9=0
3x= -5 3x=9........x=9/3
x= -5 x=3
3
..................................
5(2x+3)²=125
5(4x²+12x+9)=125
20x²+60x+45=125
20x²+60x+45-125=0
20x²+60x-80=0 dividimos todo entre 20
x²+3x-4=0
(x+4)(x-1)=0
x+4=0 x-1=0
x= -4 x=1
.........................
4∛(5x+12)=32
(4∛(5x+12))³=32³
64(5x+12)=32768
320x+768=32768
320x=32768-768
320x=32000
x=32000/320
x=100