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0.2y+0.6y(y+20)=-8+0.4y
We move all terms to the left:
0.2y+0.6y(y+20)-(-8+0.4y)=0
We add all the numbers together, and all the variables
0.2y+0.6y(y+20)-(0.4y-8)=0
We multiply parentheses
0y^2+0.2y+0y-(0.4y-8)=0
We get rid of parentheses
0y^2+0.2y+0y-0.4y+8=0
We add all the numbers together, and all the variables
y^2+0.8y+8=0
a = 1; b = 0.8; c = +8;
Δ = b2-4ac
Δ = 0.82-4·1·8
Δ = -31.36
Delta is less than zero, so there is no solution for the equation
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