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(7x-1)(0.4x-4)=0
We multiply parentheses ..
(+0x^2-28x+0x+4)=0
We get rid of parentheses
0x^2-28x+0x+4=0
We add all the numbers together, and all the variables
x^2-27x+4=0
a = 1; b = -27; c = +4;
Δ = b2-4ac
Δ = -272-4·1·4
Δ = 713
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-27)-\sqrt{713}}{2*1}=\frac{27-\sqrt{713}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-27)+\sqrt{713}}{2*1}=\frac{27+\sqrt{713}}{2} $
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