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X2+5X=414
We move all terms to the left:
X2+5X-(414)=0
We add all the numbers together, and all the variables
X^2+5X-414=0
a = 1; b = 5; c = -414;
Δ = b2-4ac
Δ = 52-4·1·(-414)
Δ = 1681
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{1681}=41$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-41}{2*1}=\frac{-46}{2} =-23 $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+41}{2*1}=\frac{36}{2} =18 $
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