0=15-10t-16t^2

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Solution for 0=15-10t-16t^2 equation:


Simplifying
0 = 15 + -10t + -16t2

Solving
0 = 15 + -10t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -15 = -15
-15 + 10t + 16t2 = 15 + -10t + -16t2 + -15 + 10t + 16t2

Reorder the terms:
-15 + 10t + 16t2 = 15 + -15 + -10t + 10t + -16t2 + 16t2

Combine like terms: 15 + -15 = 0
-15 + 10t + 16t2 = 0 + -10t + 10t + -16t2 + 16t2
-15 + 10t + 16t2 = -10t + 10t + -16t2 + 16t2

Combine like terms: -10t + 10t = 0
-15 + 10t + 16t2 = 0 + -16t2 + 16t2
-15 + 10t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-15 + 10t + 16t2 = 0

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

Divide each side by '16'.
-0.9375 + 0.625t + t2 = 0

Move the constant term to the right:

Add '0.9375' to each side of the equation.
-0.9375 + 0.625t + 0.9375 + t2 = 0 + 0.9375

Reorder the terms:
-0.9375 + 0.9375 + 0.625t + t2 = 0 + 0.9375

Combine like terms: -0.9375 + 0.9375 = 0.0000
0.0000 + 0.625t + t2 = 0 + 0.9375
0.625t + t2 = 0 + 0.9375

Combine like terms: 0 + 0.9375 = 0.9375
0.625t + t2 = 0.9375

The t term is 0.625t.  Take half its coefficient (0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
0.625t + 0.09765625 + t2 = 0.9375 + 0.09765625

Reorder the terms:
0.09765625 + 0.625t + t2 = 0.9375 + 0.09765625

Combine like terms: 0.9375 + 0.09765625 = 1.03515625
0.09765625 + 0.625t + t2 = 1.03515625

Factor a perfect square on the left side:
(t + 0.3125)(t + 0.3125) = 1.03515625

Calculate the square root of the right side: 1.017426287

Break this problem into two subproblems by setting 
(t + 0.3125) equal to 1.017426287 and -1.017426287.

Subproblem 1

t + 0.3125 = 1.017426287 Simplifying t + 0.3125 = 1.017426287 Reorder the terms: 0.3125 + t = 1.017426287 Solving 0.3125 + t = 1.017426287 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.3125' to each side of the equation. 0.3125 + -0.3125 + t = 1.017426287 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + t = 1.017426287 + -0.3125 t = 1.017426287 + -0.3125 Combine like terms: 1.017426287 + -0.3125 = 0.704926287 t = 0.704926287 Simplifying t = 0.704926287

Subproblem 2

t + 0.3125 = -1.017426287 Simplifying t + 0.3125 = -1.017426287 Reorder the terms: 0.3125 + t = -1.017426287 Solving 0.3125 + t = -1.017426287 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.3125' to each side of the equation. 0.3125 + -0.3125 + t = -1.017426287 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + t = -1.017426287 + -0.3125 t = -1.017426287 + -0.3125 Combine like terms: -1.017426287 + -0.3125 = -1.329926287 t = -1.329926287 Simplifying t = -1.329926287

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.704926287, -1.329926287}

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