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X(X.5)+5X-25=0
We add all the numbers together, and all the variables
X(+X.5)+5X-25=0
We add all the numbers together, and all the variables
5X+X(+X.5)-25=0
We multiply parentheses
X^2+5X-25=0
a = 1; b = 5; c = -25;
Δ = b2-4ac
Δ = 52-4·1·(-25)
Δ = 125
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}$$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{125}=\sqrt{25*5}=\sqrt{25}*\sqrt{5}=5\sqrt{5}$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-5\sqrt{5}}{2*1}=\frac{-5-5\sqrt{5}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+5\sqrt{5}}{2*1}=\frac{-5+5\sqrt{5}}{2} $
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