ac Method
15t^ -17t-4
ac=15*4=60
This the ac Method can you help me finished this problem
It is not clear what you mean by the "ac method" or what you are trying to solve. You also don't have an exponent after the t^ . You also have not written an equation, so there is nothing to solve.
Are you trying to solve
15t^2 -17t -4 = 0 ?
Perhaps you are refering to the "b^2 - 4ac) method of solving quadratic equations
You can rewrite the equation as
(5t +1)(3t -4)= 0
which will lead to the solutions
t = 4/3 or -1/5