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(2+z)(5z-1)=0
We add all the numbers together, and all the variables
(z+2)(5z-1)=0
We multiply parentheses ..
(+5z^2-1z+10z-2)=0
We get rid of parentheses
5z^2-1z+10z-2=0
We add all the numbers together, and all the variables
5z^2+9z-2=0
a = 5; b = 9; c = -2;
Δ = b2-4ac
Δ = 92-4·5·(-2)
Δ = 121
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$z_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$z_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{121}=11$$z_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(9)-11}{2*5}=\frac{-20}{10} =-2 $$z_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(9)+11}{2*5}=\frac{2}{10} =1/5 $
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