-16t^2+18t+15=0

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Solution for -16t^2+18t+15=0 equation:


Simplifying
-16t2 + 18t + 15 = 0

Reorder the terms:
15 + 18t + -16t2 = 0

Solving
15 + 18t + -16t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-16 the coefficient of the squared term: 

Divide each side by '-16'.
-0.9375 + -1.125t + t2 = 0

Move the constant term to the right:

Add '0.9375' to each side of the equation.
-0.9375 + -1.125t + 0.9375 + t2 = 0 + 0.9375

Reorder the terms:
-0.9375 + 0.9375 + -1.125t + t2 = 0 + 0.9375

Combine like terms: -0.9375 + 0.9375 = 0.0000
0.0000 + -1.125t + t2 = 0 + 0.9375
-1.125t + t2 = 0 + 0.9375

Combine like terms: 0 + 0.9375 = 0.9375
-1.125t + t2 = 0.9375

The t term is -1.125t.  Take half its coefficient (-0.5625).
Square it (0.31640625) and add it to both sides.

Add '0.31640625' to each side of the equation.
-1.125t + 0.31640625 + t2 = 0.9375 + 0.31640625

Reorder the terms:
0.31640625 + -1.125t + t2 = 0.9375 + 0.31640625

Combine like terms: 0.9375 + 0.31640625 = 1.25390625
0.31640625 + -1.125t + t2 = 1.25390625

Factor a perfect square on the left side:
(t + -0.5625)(t + -0.5625) = 1.25390625

Calculate the square root of the right side: 1.119779554

Break this problem into two subproblems by setting 
(t + -0.5625) equal to 1.119779554 and -1.119779554.

Subproblem 1

t + -0.5625 = 1.119779554 Simplifying t + -0.5625 = 1.119779554 Reorder the terms: -0.5625 + t = 1.119779554 Solving -0.5625 + t = 1.119779554 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + t = 1.119779554 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + t = 1.119779554 + 0.5625 t = 1.119779554 + 0.5625 Combine like terms: 1.119779554 + 0.5625 = 1.682279554 t = 1.682279554 Simplifying t = 1.682279554

Subproblem 2

t + -0.5625 = -1.119779554 Simplifying t + -0.5625 = -1.119779554 Reorder the terms: -0.5625 + t = -1.119779554 Solving -0.5625 + t = -1.119779554 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + t = -1.119779554 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + t = -1.119779554 + 0.5625 t = -1.119779554 + 0.5625 Combine like terms: -1.119779554 + 0.5625 = -0.557279554 t = -0.557279554 Simplifying t = -0.557279554

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.682279554, -0.557279554}

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