-x2+5x-7=0

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Solution for -x2+5x-7=0 equation: 



-x2+5x-7=0

We add all the numbers together, and all the variables

-1x^2+5x-7=0

a = -1; b = 5; c = -7;
Δ = b2-4ac
Δ = 52-4·(-1)·(-7)
Δ = -3
Delta is less than zero, so there is no solution for the equation

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