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(5x-4)(5x-2)=0
We multiply parentheses ..
(+25x^2-10x-20x+8)=0
We get rid of parentheses
25x^2-10x-20x+8=0
We add all the numbers together, and all the variables
25x^2-30x+8=0
a = 25; b = -30; c = +8;
Δ = b2-4ac
Δ = -302-4·25·8
Δ = 100
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{100}=10$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-30)-10}{2*25}=\frac{20}{50} =2/5 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+10}{2*25}=\frac{40}{50} =4/5 $
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