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0=x^2-15x+72
We move all terms to the left:
0-(x^2-15x+72)=0
We add all the numbers together, and all the variables
-(x^2-15x+72)=0
We get rid of parentheses
-x^2+15x-72=0
We add all the numbers together, and all the variables
-1x^2+15x-72=0
a = -1; b = 15; c = -72;
Δ = b2-4ac
Δ = 152-4·(-1)·(-72)
Δ = -63
Delta is less than zero, so there is no solution for the equation
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