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Let Z is equal to log2( 1 + i) then find the value of (z+zbar)+i(z-zbar) |
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Answer» The GIVEN equation is z 2 +z+1−a=0 If the solution is not real then Δ=b 2 −4ac of the quadratic ax 2 +bx+c=0 is LESS than zero. ⇒1−4(1−a)<0 ⇒1−4+4a<0 ⇒4a<3 ⇒a< 4 3
HENCE, all VALUES of a less than 4 3
will GIVE non-real solutions. Options A, B and C are less than 4 3
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