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X^2+10X+16=-10
We move all terms to the left:
X^2+10X+16-(-10)=0
We add all the numbers together, and all the variables
X^2+10X+26=0
a = 1; b = 10; c = +26;
Δ = b2-4ac
Δ = 102-4·1·26
Δ = -4
Delta is less than zero, so there is no solution for the equation
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