15=-16t^2+27t+5

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Solution for 15=-16t^2+27t+5 equation:


Simplifying
15 = -16t2 + 27t + 5

Reorder the terms:
15 = 5 + 27t + -16t2

Solving
15 = 5 + 27t + -16t2

Solving for variable 't'.

Combine like terms: 15 + -5 = 10
10 + -27t + 16t2 = 5 + 27t + -16t2 + -5 + -27t + 16t2

Reorder the terms:
10 + -27t + 16t2 = 5 + -5 + 27t + -27t + -16t2 + 16t2

Combine like terms: 5 + -5 = 0
10 + -27t + 16t2 = 0 + 27t + -27t + -16t2 + 16t2
10 + -27t + 16t2 = 27t + -27t + -16t2 + 16t2

Combine like terms: 27t + -27t = 0
10 + -27t + 16t2 = 0 + -16t2 + 16t2
10 + -27t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
10 + -27t + 16t2 = 0

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

Divide each side by '16'.
0.625 + -1.6875t + t2 = 0

Move the constant term to the right:

Add '-0.625' to each side of the equation.
0.625 + -1.6875t + -0.625 + t2 = 0 + -0.625

Reorder the terms:
0.625 + -0.625 + -1.6875t + t2 = 0 + -0.625

Combine like terms: 0.625 + -0.625 = 0.000
0.000 + -1.6875t + t2 = 0 + -0.625
-1.6875t + t2 = 0 + -0.625

Combine like terms: 0 + -0.625 = -0.625
-1.6875t + t2 = -0.625

The t term is -1.6875t.  Take half its coefficient (-0.84375).
Square it (0.7119140625) and add it to both sides.

Add '0.7119140625' to each side of the equation.
-1.6875t + 0.7119140625 + t2 = -0.625 + 0.7119140625

Reorder the terms:
0.7119140625 + -1.6875t + t2 = -0.625 + 0.7119140625

Combine like terms: -0.625 + 0.7119140625 = 0.0869140625
0.7119140625 + -1.6875t + t2 = 0.0869140625

Factor a perfect square on the left side:
(t + -0.84375)(t + -0.84375) = 0.0869140625

Calculate the square root of the right side: 0.29481191

Break this problem into two subproblems by setting 
(t + -0.84375) equal to 0.29481191 and -0.29481191.

Subproblem 1

t + -0.84375 = 0.29481191 Simplifying t + -0.84375 = 0.29481191 Reorder the terms: -0.84375 + t = 0.29481191 Solving -0.84375 + t = 0.29481191 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.84375' to each side of the equation. -0.84375 + 0.84375 + t = 0.29481191 + 0.84375 Combine like terms: -0.84375 + 0.84375 = 0.00000 0.00000 + t = 0.29481191 + 0.84375 t = 0.29481191 + 0.84375 Combine like terms: 0.29481191 + 0.84375 = 1.13856191 t = 1.13856191 Simplifying t = 1.13856191

Subproblem 2

t + -0.84375 = -0.29481191 Simplifying t + -0.84375 = -0.29481191 Reorder the terms: -0.84375 + t = -0.29481191 Solving -0.84375 + t = -0.29481191 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.84375' to each side of the equation. -0.84375 + 0.84375 + t = -0.29481191 + 0.84375 Combine like terms: -0.84375 + 0.84375 = 0.00000 0.00000 + t = -0.29481191 + 0.84375 t = -0.29481191 + 0.84375 Combine like terms: -0.29481191 + 0.84375 = 0.54893809 t = 0.54893809 Simplifying t = 0.54893809

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.13856191, 0.54893809}

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