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(9x-13)(9x-13)-2(9x-13)+1=0
We multiply parentheses
(9x-13)(9x-13)-18x+26+1=0
We multiply parentheses ..
(+81x^2-117x-117x+169)-18x+26+1=0
We add all the numbers together, and all the variables
(+81x^2-117x-117x+169)-18x+27=0
We get rid of parentheses
81x^2-117x-117x-18x+169+27=0
We add all the numbers together, and all the variables
81x^2-252x+196=0
a = 81; b = -252; c = +196;
Δ = b2-4ac
Δ = -2522-4·81·196
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{252}{162}=1+5/9$
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