x(x-4)=4(x-9)

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Solution for x(x-4)=4(x-9) equation: 



x(x-4)=4(x-9)

We move all terms to the left:

x(x-4)-(4(x-9))=0

We multiply parentheses

x^2-4x-(4(x-9))=0



We calculate terms in parentheses: -(4(x-9)), so:

4(x-9)

We multiply parentheses

4x-36

Back to the equation:

-(4x-36)



We get rid of parentheses

x^2-4x-4x+36=0

We add all the numbers together, and all the variables

x^2-8x+36=0

a = 1; b = -8; c = +36;
Δ = b2-4ac
Δ = -82-4·1·36
Δ = -80
Delta is less than zero, so there is no solution for the equation

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