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(2x-1)(4x+5)=0
We multiply parentheses ..
(+8x^2+10x-4x-5)=0
We get rid of parentheses
8x^2+10x-4x-5=0
We add all the numbers together, and all the variables
8x^2+6x-5=0
a = 8; b = 6; c = -5;
Δ = b2-4ac
Δ = 62-4·8·(-5)
Δ = 196
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{196}=14$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-14}{2*8}=\frac{-20}{16} =-1+1/4 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+14}{2*8}=\frac{8}{16} =1/2 $
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