Solve for t
t=0
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0\times 1\left(t-130\right)=-400t
Multiply 800 and 0 to get 0.
0\left(t-130\right)=-400t
Multiply 0 and 1 to get 0.
0=-400t
Anything times zero gives zero.
-400t=0
Swap sides so that all variable terms are on the left hand side.
t=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -400 is not equal to 0, t must be equal to 0.
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