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Quadretic Equations - Coggle Diagram

- - - - If Δ=b2- 4ac=0, there are rwo equal real roots such that x1=x2=b/2a
      - If Δ=b2- 4ac<0, there is no real root and the solution set is empty on R SS=∅
      - If Δ=b2- 4ac>0, there are two distinct real roots such that x1=-b+√¯Δ / 2a, x2= -b - √¯Δ / 2a.
- - - - Note: The number √¯-1=i is said the unit of imaginary number. Then, divide the power of "i" by 4 then look at remainder.
    - - The two complex numbers a+bi and a-bi are called conjugates of each other and the conjugate of x=a+bi is denoted by x̄=a-bi
    - - Ex: x2+2x+2=0 SS={(-1+1),(-1-1)}