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72.99+20.20y(0.007799-y)=100-8.7y(1+y)
We move all terms to the left:
72.99+20.20y(0.007799-y)-(100-8.7y(1+y))=0
We add all the numbers together, and all the variables
20.20y(-1y+0.007799)-(100-8.7y(y+1))+72.99=0
We multiply parentheses
-20y^2+0.15598y-(100-8.7y(y+1))+72.99=0
We calculate terms in parentheses: -(100-8.7y(y+1)), so:We get rid of parentheses
100-8.7y(y+1)
determiningTheFunctionDomain -8.7y(y+1)+100
We multiply parentheses
-8y^2-8y+100
Back to the equation:
-(-8y^2-8y+100)
-20y^2+8y^2+8y+0.15598y-100+72.99=0
We add all the numbers together, and all the variables
-12y^2+8.15598y-27.01=0
a = -12; b = 8.15598; c = -27.01;
Δ = b2-4ac
Δ = 8.155982-4·(-12)·(-27.01)
Δ = -1229.9599902396
Delta is less than zero, so there is no solution for the equation
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