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X2+7X+7=0
We add all the numbers together, and all the variables
X^2+7X+7=0
a = 1; b = 7; c = +7;
Δ = b2-4ac
Δ = 72-4·1·7
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{-(7)-\sqrt{21}}{2*1}=\frac{-7-\sqrt{21}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+\sqrt{21}}{2*1}=\frac{-7+\sqrt{21}}{2} $
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