If \( x=a+b i \) is a complex number such that \( x^{2}=3+4 i \) and \( x^{3}=2+11 i \) where \(...

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If \( x=a+b i \) is a complex number such that \( x^{2}=3+4 i \) and \( x^{3}=2+11 i \) where \( i=\sqrt{-1} \), then \( (a+b) \) equals to
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