123=-16t^2+123t+5

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Solution for 123=-16t^2+123t+5 equation:


Simplifying
123 = -16t2 + 123t + 5

Reorder the terms:
123 = 5 + 123t + -16t2

Solving
123 = 5 + 123t + -16t2

Solving for variable 't'.

Combine like terms: 123 + -5 = 118
118 + -123t + 16t2 = 5 + 123t + -16t2 + -5 + -123t + 16t2

Reorder the terms:
118 + -123t + 16t2 = 5 + -5 + 123t + -123t + -16t2 + 16t2

Combine like terms: 5 + -5 = 0
118 + -123t + 16t2 = 0 + 123t + -123t + -16t2 + 16t2
118 + -123t + 16t2 = 123t + -123t + -16t2 + 16t2

Combine like terms: 123t + -123t = 0
118 + -123t + 16t2 = 0 + -16t2 + 16t2
118 + -123t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
118 + -123t + 16t2 = 0

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

Divide each side by '16'.
7.375 + -7.6875t + t2 = 0

Move the constant term to the right:

Add '-7.375' to each side of the equation.
7.375 + -7.6875t + -7.375 + t2 = 0 + -7.375

Reorder the terms:
7.375 + -7.375 + -7.6875t + t2 = 0 + -7.375

Combine like terms: 7.375 + -7.375 = 0.000
0.000 + -7.6875t + t2 = 0 + -7.375
-7.6875t + t2 = 0 + -7.375

Combine like terms: 0 + -7.375 = -7.375
-7.6875t + t2 = -7.375

The t term is -7.6875t.  Take half its coefficient (-3.84375).
Square it (14.77441406) and add it to both sides.

Add '14.77441406' to each side of the equation.
-7.6875t + 14.77441406 + t2 = -7.375 + 14.77441406

Reorder the terms:
14.77441406 + -7.6875t + t2 = -7.375 + 14.77441406

Combine like terms: -7.375 + 14.77441406 = 7.39941406
14.77441406 + -7.6875t + t2 = 7.39941406

Factor a perfect square on the left side:
(t + -3.84375)(t + -3.84375) = 7.39941406

Calculate the square root of the right side: 2.720186402

Break this problem into two subproblems by setting 
(t + -3.84375) equal to 2.720186402 and -2.720186402.

Subproblem 1

t + -3.84375 = 2.720186402 Simplifying t + -3.84375 = 2.720186402 Reorder the terms: -3.84375 + t = 2.720186402 Solving -3.84375 + t = 2.720186402 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.84375' to each side of the equation. -3.84375 + 3.84375 + t = 2.720186402 + 3.84375 Combine like terms: -3.84375 + 3.84375 = 0.00000 0.00000 + t = 2.720186402 + 3.84375 t = 2.720186402 + 3.84375 Combine like terms: 2.720186402 + 3.84375 = 6.563936402 t = 6.563936402 Simplifying t = 6.563936402

Subproblem 2

t + -3.84375 = -2.720186402 Simplifying t + -3.84375 = -2.720186402 Reorder the terms: -3.84375 + t = -2.720186402 Solving -3.84375 + t = -2.720186402 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.84375' to each side of the equation. -3.84375 + 3.84375 + t = -2.720186402 + 3.84375 Combine like terms: -3.84375 + 3.84375 = 0.00000 0.00000 + t = -2.720186402 + 3.84375 t = -2.720186402 + 3.84375 Combine like terms: -2.720186402 + 3.84375 = 1.123563598 t = 1.123563598 Simplifying t = 1.123563598

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.563936402, 1.123563598}

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