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

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


Simplifying
0 = -16t2 + -15t + 15

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

Solving
0 = 15 + -15t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -15 = -15
-15 + 15t + 16t2 = 15 + -15t + -16t2 + -15 + 15t + 16t2

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

Combine like terms: 15 + -15 = 0
-15 + 15t + 16t2 = 0 + -15t + 15t + -16t2 + 16t2
-15 + 15t + 16t2 = -15t + 15t + -16t2 + 16t2

Combine like terms: -15t + 15t = 0
-15 + 15t + 16t2 = 0 + -16t2 + 16t2
-15 + 15t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-15 + 15t + 16t2 = 0

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

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

Move the constant term to the right:

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

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

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

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

The t term is 0.9375t.  Take half its coefficient (0.46875).
Square it (0.2197265625) and add it to both sides.

Add '0.2197265625' to each side of the equation.
0.9375t + 0.2197265625 + t2 = 0.9375 + 0.2197265625

Reorder the terms:
0.2197265625 + 0.9375t + t2 = 0.9375 + 0.2197265625

Combine like terms: 0.9375 + 0.2197265625 = 1.1572265625
0.2197265625 + 0.9375t + t2 = 1.1572265625

Factor a perfect square on the left side:
(t + 0.46875)(t + 0.46875) = 1.1572265625

Calculate the square root of the right side: 1.075744655

Break this problem into two subproblems by setting 
(t + 0.46875) equal to 1.075744655 and -1.075744655.

Subproblem 1

t + 0.46875 = 1.075744655 Simplifying t + 0.46875 = 1.075744655 Reorder the terms: 0.46875 + t = 1.075744655 Solving 0.46875 + t = 1.075744655 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.46875' to each side of the equation. 0.46875 + -0.46875 + t = 1.075744655 + -0.46875 Combine like terms: 0.46875 + -0.46875 = 0.00000 0.00000 + t = 1.075744655 + -0.46875 t = 1.075744655 + -0.46875 Combine like terms: 1.075744655 + -0.46875 = 0.606994655 t = 0.606994655 Simplifying t = 0.606994655

Subproblem 2

t + 0.46875 = -1.075744655 Simplifying t + 0.46875 = -1.075744655 Reorder the terms: 0.46875 + t = -1.075744655 Solving 0.46875 + t = -1.075744655 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.46875' to each side of the equation. 0.46875 + -0.46875 + t = -1.075744655 + -0.46875 Combine like terms: 0.46875 + -0.46875 = 0.00000 0.00000 + t = -1.075744655 + -0.46875 t = -1.075744655 + -0.46875 Combine like terms: -1.075744655 + -0.46875 = -1.544494655 t = -1.544494655 Simplifying t = -1.544494655

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.606994655, -1.544494655}

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