SOLUTION: Solve the equation. Round the solutions to the nearest hundredth, if necessary. -t^2 + 2t + 15 = 0

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Solve the equation. Round the solutions to the nearest hundredth, if necessary. -t^2 + 2t + 15 = 0      Log On


   

Question 892234: Solve the equation. Round the solutions to the nearest hundredth, if necessary.
-t^2 + 2t + 15 = 0
Found 2 solutions by LinnW, richwmiller:
Answer by LinnW(1048) About Me  (Show Source):
You can put this solution on YOUR website!
-t^2 + 2t + 15 = 0
multiply each side by -1
t^2 -2t -15 = 0
(t - 5)(t + 3) = 0
So t = 5 or t = -3

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
multiply by -1
t^2-2t-15=0
find factors of -15 which add up to -2
-5 and 3
(t-5)*(t+3)=0
t=5
t=-3