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4t(5t+4)=0
We multiply parentheses
20t^2+16t=0
a = 20; b = 16; c = 0;
Δ = b2-4ac
Δ = 162-4·20·0
Δ = 256
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{256}=16$$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(16)-16}{2*20}=\frac{-32}{40} =-4/5 $$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(16)+16}{2*20}=\frac{0}{40} =0 $
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