-15=64t-16t^2

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Solution for -15=64t-16t^2 equation:


Simplifying
-15 = 64t + -16t2

Solving
-15 = 64t + -16t2

Solving for variable 't'.

Reorder the terms:
-15 + -64t + 16t2 = 64t + -64t + -16t2 + 16t2

Combine like terms: 64t + -64t = 0
-15 + -64t + 16t2 = 0 + -16t2 + 16t2
-15 + -64t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-15 + -64t + 16t2 = 0

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

Divide each side by '16'.
-0.9375 + -4t + t2 = 0

Move the constant term to the right:

Add '0.9375' to each side of the equation.
-0.9375 + -4t + 0.9375 + t2 = 0 + 0.9375

Reorder the terms:
-0.9375 + 0.9375 + -4t + t2 = 0 + 0.9375

Combine like terms: -0.9375 + 0.9375 = 0.0000
0.0000 + -4t + t2 = 0 + 0.9375
-4t + t2 = 0 + 0.9375

Combine like terms: 0 + 0.9375 = 0.9375
-4t + t2 = 0.9375

The t term is -4t.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4t + 4 + t2 = 0.9375 + 4

Reorder the terms:
4 + -4t + t2 = 0.9375 + 4

Combine like terms: 0.9375 + 4 = 4.9375
4 + -4t + t2 = 4.9375

Factor a perfect square on the left side:
(t + -2)(t + -2) = 4.9375

Calculate the square root of the right side: 2.222048604

Break this problem into two subproblems by setting 
(t + -2) equal to 2.222048604 and -2.222048604.

Subproblem 1

t + -2 = 2.222048604 Simplifying t + -2 = 2.222048604 Reorder the terms: -2 + t = 2.222048604 Solving -2 + t = 2.222048604 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + t = 2.222048604 + 2 Combine like terms: -2 + 2 = 0 0 + t = 2.222048604 + 2 t = 2.222048604 + 2 Combine like terms: 2.222048604 + 2 = 4.222048604 t = 4.222048604 Simplifying t = 4.222048604

Subproblem 2

t + -2 = -2.222048604 Simplifying t + -2 = -2.222048604 Reorder the terms: -2 + t = -2.222048604 Solving -2 + t = -2.222048604 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + t = -2.222048604 + 2 Combine like terms: -2 + 2 = 0 0 + t = -2.222048604 + 2 t = -2.222048604 + 2 Combine like terms: -2.222048604 + 2 = -0.222048604 t = -0.222048604 Simplifying t = -0.222048604

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.222048604, -0.222048604}

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