3x pangkat 2 + 18×+5=

3x² + 18x + 5 = pakai rumus abc
x = -b ± √b²-4ac/2a
x = -18 ±√(18)²-(4)(3)(5)/2(3)
x= -18 ±√324-60/6
x= -18 ±√264/6
x= -3±2√66
X1 = -3 + 2√66 ,atau
X2 = -3 - 2√66