84=-16t^2+76t+3

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Solution for 84=-16t^2+76t+3 equation:


Simplifying
84 = -16t2 + 76t + 3

Reorder the terms:
84 = 3 + 76t + -16t2

Solving
84 = 3 + 76t + -16t2

Solving for variable 't'.

Combine like terms: 84 + -3 = 81
81 + -76t + 16t2 = 3 + 76t + -16t2 + -3 + -76t + 16t2

Reorder the terms:
81 + -76t + 16t2 = 3 + -3 + 76t + -76t + -16t2 + 16t2

Combine like terms: 3 + -3 = 0
81 + -76t + 16t2 = 0 + 76t + -76t + -16t2 + 16t2
81 + -76t + 16t2 = 76t + -76t + -16t2 + 16t2

Combine like terms: 76t + -76t = 0
81 + -76t + 16t2 = 0 + -16t2 + 16t2
81 + -76t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
81 + -76t + 16t2 = 0

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

Divide each side by '16'.
5.0625 + -4.75t + t2 = 0

Move the constant term to the right:

Add '-5.0625' to each side of the equation.
5.0625 + -4.75t + -5.0625 + t2 = 0 + -5.0625

Reorder the terms:
5.0625 + -5.0625 + -4.75t + t2 = 0 + -5.0625

Combine like terms: 5.0625 + -5.0625 = 0.0000
0.0000 + -4.75t + t2 = 0 + -5.0625
-4.75t + t2 = 0 + -5.0625

Combine like terms: 0 + -5.0625 = -5.0625
-4.75t + t2 = -5.0625

The t term is -4.75t.  Take half its coefficient (-2.375).
Square it (5.640625) and add it to both sides.

Add '5.640625' to each side of the equation.
-4.75t + 5.640625 + t2 = -5.0625 + 5.640625

Reorder the terms:
5.640625 + -4.75t + t2 = -5.0625 + 5.640625

Combine like terms: -5.0625 + 5.640625 = 0.578125
5.640625 + -4.75t + t2 = 0.578125

Factor a perfect square on the left side:
(t + -2.375)(t + -2.375) = 0.578125

Calculate the square root of the right side: 0.760345316

Break this problem into two subproblems by setting 
(t + -2.375) equal to 0.760345316 and -0.760345316.

Subproblem 1

t + -2.375 = 0.760345316 Simplifying t + -2.375 = 0.760345316 Reorder the terms: -2.375 + t = 0.760345316 Solving -2.375 + t = 0.760345316 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.375' to each side of the equation. -2.375 + 2.375 + t = 0.760345316 + 2.375 Combine like terms: -2.375 + 2.375 = 0.000 0.000 + t = 0.760345316 + 2.375 t = 0.760345316 + 2.375 Combine like terms: 0.760345316 + 2.375 = 3.135345316 t = 3.135345316 Simplifying t = 3.135345316

Subproblem 2

t + -2.375 = -0.760345316 Simplifying t + -2.375 = -0.760345316 Reorder the terms: -2.375 + t = -0.760345316 Solving -2.375 + t = -0.760345316 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.375' to each side of the equation. -2.375 + 2.375 + t = -0.760345316 + 2.375 Combine like terms: -2.375 + 2.375 = 0.000 0.000 + t = -0.760345316 + 2.375 t = -0.760345316 + 2.375 Combine like terms: -0.760345316 + 2.375 = 1.614654684 t = 1.614654684 Simplifying t = 1.614654684

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.135345316, 1.614654684}

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