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0=10t^2-40t+240
We move all terms to the left:
0-(10t^2-40t+240)=0
We add all the numbers together, and all the variables
-(10t^2-40t+240)=0
We get rid of parentheses
-10t^2+40t-240=0
a = -10; b = 40; c = -240;
Δ = b2-4ac
Δ = 402-4·(-10)·(-240)
Δ = -8000
Delta is less than zero, so there is no solution for the equation
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