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(x+5)*4-x*x=1
We move all terms to the left:
(x+5)*4-x*x-(1)=0
We multiply parentheses
4x-x*x+20-1=0
Wy multiply elements
-1x^2+4x+20-1=0
We add all the numbers together, and all the variables
-1x^2+4x+19=0
a = -1; b = 4; c = +19;
Δ = b2-4ac
Δ = 42-4·(-1)·19
Δ = 92
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{92}=\sqrt{4*23}=\sqrt{4}*\sqrt{23}=2\sqrt{23}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-2\sqrt{23}}{2*-1}=\frac{-4-2\sqrt{23}}{-2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+2\sqrt{23}}{2*-1}=\frac{-4+2\sqrt{23}}{-2} $
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