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x2=81.x=
We move all terms to the left:
x2-(81.x)=0
We add all the numbers together, and all the variables
x2-(+81.x)=0
We add all the numbers together, and all the variables
x^2-(+81.x)=0
We get rid of parentheses
x^2-81.x=0
We add all the numbers together, and all the variables
x^2-81x=0
a = 1; b = -81; c = 0;
Δ = b2-4ac
Δ = -812-4·1·0
Δ = 6561
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{6561}=81$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-81)-81}{2*1}=\frac{0}{2} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-81)+81}{2*1}=\frac{162}{2} =81 $
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