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x³+3*14=5²*10+8
x³+3*14=25*10+8
x³+42=250+8
x³+42=258
x³=258-42
x³=216
x=∛216
x=6
B)
3*100+26+√x=12*28
300+26+√x=336
326+√x=336
√x=336-326
√x=10
x=10²
x=100
C)
√(6*(x+9))=2*6
√(6*(x+9))=8
6*(x+9)=8²
6*(x+9)=64
x+9=64/6
x+9=10,66666666...
x=10,66666666...-9
x=1,66666666... aproximadamente