y(y+7)=9(y-1)

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Solution for y(y+7)=9(y-1) equation: 



y(y+7)=9(y-1)

We move all terms to the left:

y(y+7)-(9(y-1))=0

We multiply parentheses

y^2+7y-(9(y-1))=0



We calculate terms in parentheses: -(9(y-1)), so:

9(y-1)

We multiply parentheses

9y-9

Back to the equation:

-(9y-9)



We get rid of parentheses

y^2+7y-9y+9=0

We add all the numbers together, and all the variables

y^2-2y+9=0

a = 1; b = -2; c = +9;
Δ = b2-4ac
Δ = -22-4·1·9
Δ = -32
Delta is less than zero, so there is no solution for the equation

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