-16t^2+20t=5

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Solution for -16t^2+20t=5 equation:


Simplifying
-16t2 + 20t = 5

Reorder the terms:
20t + -16t2 = 5

Solving
20t + -16t2 = 5

Solving for variable 't'.

Reorder the terms:
-5 + 20t + -16t2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 20t + -16t2 = 0

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

Divide each side by '-16'.
0.3125 + -1.25t + t2 = 0

Move the constant term to the right:

Add '-0.3125' to each side of the equation.
0.3125 + -1.25t + -0.3125 + t2 = 0 + -0.3125

Reorder the terms:
0.3125 + -0.3125 + -1.25t + t2 = 0 + -0.3125

Combine like terms: 0.3125 + -0.3125 = 0.0000
0.0000 + -1.25t + t2 = 0 + -0.3125
-1.25t + t2 = 0 + -0.3125

Combine like terms: 0 + -0.3125 = -0.3125
-1.25t + t2 = -0.3125

The t term is -1.25t.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25t + 0.390625 + t2 = -0.3125 + 0.390625

Reorder the terms:
0.390625 + -1.25t + t2 = -0.3125 + 0.390625

Combine like terms: -0.3125 + 0.390625 = 0.078125
0.390625 + -1.25t + t2 = 0.078125

Factor a perfect square on the left side:
(t + -0.625)(t + -0.625) = 0.078125

Calculate the square root of the right side: 0.279508497

Break this problem into two subproblems by setting 
(t + -0.625) equal to 0.279508497 and -0.279508497.

Subproblem 1

t + -0.625 = 0.279508497 Simplifying t + -0.625 = 0.279508497 Reorder the terms: -0.625 + t = 0.279508497 Solving -0.625 + t = 0.279508497 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = 0.279508497 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = 0.279508497 + 0.625 t = 0.279508497 + 0.625 Combine like terms: 0.279508497 + 0.625 = 0.904508497 t = 0.904508497 Simplifying t = 0.904508497

Subproblem 2

t + -0.625 = -0.279508497 Simplifying t + -0.625 = -0.279508497 Reorder the terms: -0.625 + t = -0.279508497 Solving -0.625 + t = -0.279508497 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = -0.279508497 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = -0.279508497 + 0.625 t = -0.279508497 + 0.625 Combine like terms: -0.279508497 + 0.625 = 0.345491503 t = 0.345491503 Simplifying t = 0.345491503

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.904508497, 0.345491503}

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