Question

what is the solution set of x²+2x+6=0 over compex no

a{-√5,2i,-2i} b,{0,2√2i,-2√2i}

c,[-1,1 +√2i, 1-√2i} d{-1+√5i,-1-√5i}

Answer 1

Answer:

Use formula method,

compair with general form of quadratic ploynomial, i. e ax^2 +bx +c =0

x = -b (+-)√(b^2-4ac)/2a

= -2^2 (+-) √2^2-4*1*6/2*1

= -4(+-) √4-24/2

= -4(+-)√-20/2

= -2(+-)√-5

= -2(+-)√5i