400=-16t^2+128t+80

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Solution for 400=-16t^2+128t+80 equation: 



400=-16t^2+128t+80

We move all terms to the left:

400-(-16t^2+128t+80)=0

We get rid of parentheses

16t^2-128t-80+400=0

We add all the numbers together, and all the variables

16t^2-128t+320=0

a = 16; b = -128; c = +320;
Δ = b2-4ac
Δ = -1282-4·16·320
Δ = -4096
Delta is less than zero, so there is no solution for the equation

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