-100=-16t^2+5t+4

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Solution for -100=-16t^2+5t+4 equation:


Simplifying
-100 = -16t2 + 5t + 4

Reorder the terms:
-100 = 4 + 5t + -16t2

Solving
-100 = 4 + 5t + -16t2

Solving for variable 't'.

Combine like terms: -100 + -4 = -104
-104 + -5t + 16t2 = 4 + 5t + -16t2 + -4 + -5t + 16t2

Reorder the terms:
-104 + -5t + 16t2 = 4 + -4 + 5t + -5t + -16t2 + 16t2

Combine like terms: 4 + -4 = 0
-104 + -5t + 16t2 = 0 + 5t + -5t + -16t2 + 16t2
-104 + -5t + 16t2 = 5t + -5t + -16t2 + 16t2

Combine like terms: 5t + -5t = 0
-104 + -5t + 16t2 = 0 + -16t2 + 16t2
-104 + -5t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-104 + -5t + 16t2 = 0

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

Divide each side by '16'.
-6.5 + -0.3125t + t2 = 0

Move the constant term to the right:

Add '6.5' to each side of the equation.
-6.5 + -0.3125t + 6.5 + t2 = 0 + 6.5

Reorder the terms:
-6.5 + 6.5 + -0.3125t + t2 = 0 + 6.5

Combine like terms: -6.5 + 6.5 = 0.0
0.0 + -0.3125t + t2 = 0 + 6.5
-0.3125t + t2 = 0 + 6.5

Combine like terms: 0 + 6.5 = 6.5
-0.3125t + t2 = 6.5

The t term is -0.3125t.  Take half its coefficient (-0.15625).
Square it (0.0244140625) and add it to both sides.

Add '0.0244140625' to each side of the equation.
-0.3125t + 0.0244140625 + t2 = 6.5 + 0.0244140625

Reorder the terms:
0.0244140625 + -0.3125t + t2 = 6.5 + 0.0244140625

Combine like terms: 6.5 + 0.0244140625 = 6.5244140625
0.0244140625 + -0.3125t + t2 = 6.5244140625

Factor a perfect square on the left side:
(t + -0.15625)(t + -0.15625) = 6.5244140625

Calculate the square root of the right side: 2.554293261

Break this problem into two subproblems by setting 
(t + -0.15625) equal to 2.554293261 and -2.554293261.

Subproblem 1

t + -0.15625 = 2.554293261 Simplifying t + -0.15625 = 2.554293261 Reorder the terms: -0.15625 + t = 2.554293261 Solving -0.15625 + t = 2.554293261 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.15625' to each side of the equation. -0.15625 + 0.15625 + t = 2.554293261 + 0.15625 Combine like terms: -0.15625 + 0.15625 = 0.00000 0.00000 + t = 2.554293261 + 0.15625 t = 2.554293261 + 0.15625 Combine like terms: 2.554293261 + 0.15625 = 2.710543261 t = 2.710543261 Simplifying t = 2.710543261

Subproblem 2

t + -0.15625 = -2.554293261 Simplifying t + -0.15625 = -2.554293261 Reorder the terms: -0.15625 + t = -2.554293261 Solving -0.15625 + t = -2.554293261 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.15625' to each side of the equation. -0.15625 + 0.15625 + t = -2.554293261 + 0.15625 Combine like terms: -0.15625 + 0.15625 = 0.00000 0.00000 + t = -2.554293261 + 0.15625 t = -2.554293261 + 0.15625 Combine like terms: -2.554293261 + 0.15625 = -2.398043261 t = -2.398043261 Simplifying t = -2.398043261

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.710543261, -2.398043261}

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