0=-16t^2+15t+4

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Solution for 0=-16t^2+15t+4 equation:


Simplifying
0 = -16t2 + 15t + 4

Reorder the terms:
0 = 4 + 15t + -16t2

Solving
0 = 4 + 15t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -4 = -4
-4 + -15t + 16t2 = 4 + 15t + -16t2 + -4 + -15t + 16t2

Reorder the terms:
-4 + -15t + 16t2 = 4 + -4 + 15t + -15t + -16t2 + 16t2

Combine like terms: 4 + -4 = 0
-4 + -15t + 16t2 = 0 + 15t + -15t + -16t2 + 16t2
-4 + -15t + 16t2 = 15t + -15t + -16t2 + 16t2

Combine like terms: 15t + -15t = 0
-4 + -15t + 16t2 = 0 + -16t2 + 16t2
-4 + -15t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-4 + -15t + 16t2 = 0

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

Divide each side by '16'.
-0.25 + -0.9375t + t2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -0.9375t + 0.25 + t2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -0.9375t + t2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -0.9375t + t2 = 0 + 0.25
-0.9375t + t2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-0.9375t + t2 = 0.25

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 = 0.25 + 0.2197265625

Reorder the terms:
0.2197265625 + -0.9375t + t2 = 0.25 + 0.2197265625

Combine like terms: 0.25 + 0.2197265625 = 0.4697265625
0.2197265625 + -0.9375t + t2 = 0.4697265625

Factor a perfect square on the left side:
(t + -0.46875)(t + -0.46875) = 0.4697265625

Calculate the square root of the right side: 0.685366006

Break this problem into two subproblems by setting 
(t + -0.46875) equal to 0.685366006 and -0.685366006.

Subproblem 1

t + -0.46875 = 0.685366006 Simplifying t + -0.46875 = 0.685366006 Reorder the terms: -0.46875 + t = 0.685366006 Solving -0.46875 + t = 0.685366006 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 = 0.685366006 + 0.46875 Combine like terms: -0.46875 + 0.46875 = 0.00000 0.00000 + t = 0.685366006 + 0.46875 t = 0.685366006 + 0.46875 Combine like terms: 0.685366006 + 0.46875 = 1.154116006 t = 1.154116006 Simplifying t = 1.154116006

Subproblem 2

t + -0.46875 = -0.685366006 Simplifying t + -0.46875 = -0.685366006 Reorder the terms: -0.46875 + t = -0.685366006 Solving -0.46875 + t = -0.685366006 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 = -0.685366006 + 0.46875 Combine like terms: -0.46875 + 0.46875 = 0.00000 0.00000 + t = -0.685366006 + 0.46875 t = -0.685366006 + 0.46875 Combine like terms: -0.685366006 + 0.46875 = -0.216616006 t = -0.216616006 Simplifying t = -0.216616006

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.154116006, -0.216616006}

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