If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(5+4i)(4-i)=0
We add all the numbers together, and all the variables
(4i+5)(-1i+4)=0
We multiply parentheses ..
(-4i^2+16i-5i+20)=0
We get rid of parentheses
-4i^2+16i-5i+20=0
We add all the numbers together, and all the variables
-4i^2+11i+20=0
a = -4; b = 11; c = +20;
Δ = b2-4ac
Δ = 112-4·(-4)·20
Δ = 441
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$i_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$i_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{441}=21$$i_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(11)-21}{2*-4}=\frac{-32}{-8} =+4 $$i_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(11)+21}{2*-4}=\frac{10}{-8} =-1+1/4 $
| 25-4k=9 | | 15•x-8=28+9 | | -0,3y-y=-2,6 | | 2x+A=A*X+4 | | 2y-11=-3y+4 | | 16^2x-1=64 | | 5(2c+7)-3c=7 | | -4=10k-12=-3-39 | | (x+5)(x-6)=51 | | 0.3h-02.16=9.9 | | 12x+5-9x=10 | | 3w/2=7/4 | | 71+r=75 | | 3y–12(1.75+0.25y)=–21 | | 5=14-r | | 14=18-2w | | 36=7g-13 | | 7k-2=-99 | | 1/x-5=70 | | 36=3m+24 | | -8(-8x-6)=-6-22x | | x=(2/22)*(3) | | P(x)=–0.25x²+850–75000 | | F(n)=F(F(n-1))+F(n-F(n-1)) | | 2x+x=330,000 | | 153a+7=67 | | 8y×9=72y | | T-1=i/5 | | X+4y=47 | | -13=r-4 | | 7p+15-5p+10=-17p+3p | | 15=5+2(@@x+3) |