For what real value of kkk is the complex number (2+ki)(3−2i)(2 + ki)(3 - 2i)(2+ki)(3−2i) purely real?
frac43\\\\frac{4}{3}frac43
−frac43-\\\\frac{4}{3}−frac43
frac34\\\\frac{3}{4}frac34
−frac34-\\\\frac{3}{4}−frac34