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(16.8+2.4i)(7-i)=120
We move all terms to the left:
(16.8+2.4i)(7-i)-(120)=0
We add all the numbers together, and all the variables
(2.4i+16.8)(-1i+7)-120=0
We multiply parentheses ..
(-2i^2+14i-16.8i+117.6)-120=0
We get rid of parentheses
-2i^2+14i-16.8i+117.6-120=0
We add all the numbers together, and all the variables
-2i^2-2.8i-2.4=0
a = -2; b = -2.8; c = -2.4;
Δ = b2-4ac
Δ = -2.82-4·(-2)·(-2.4)
Δ = -11.36
Delta is less than zero, so there is no solution for the equation
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