0=-x^2+15x-100

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Solution for 0=-x^2+15x-100 equation: 



0=-x^2+15x-100

We move all terms to the left:

0-(-x^2+15x-100)=0

We add all the numbers together, and all the variables

-(-x^2+15x-100)=0

We get rid of parentheses

x^2-15x+100=0

a = 1; b = -15; c = +100;
Δ = b2-4ac
Δ = -152-4·1·100
Δ = -175
Delta is less than zero, so there is no solution for the equation

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