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(1+4x)(1+0.8x)=0
We add all the numbers together, and all the variables
(4x+1)(0.8x+1)=0
We multiply parentheses ..
(+0x^2+4x+0x+1)=0
We get rid of parentheses
0x^2+4x+0x+1=0
We add all the numbers together, and all the variables
x^2+5x+1=0
a = 1; b = 5; c = +1;
Δ = b2-4ac
Δ = 52-4·1·1
Δ = 21
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{-(5)-\sqrt{21}}{2*1}=\frac{-5-\sqrt{21}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{21}}{2*1}=\frac{-5+\sqrt{21}}{2} $
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