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40=-16t^2+40t+10
We move all terms to the left:
40-(-16t^2+40t+10)=0
We get rid of parentheses
16t^2-40t-10+40=0
We add all the numbers together, and all the variables
16t^2-40t+30=0
a = 16; b = -40; c = +30;
Δ = b2-4ac
Δ = -402-4·16·30
Δ = -320
Delta is less than zero, so there is no solution for the equation
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