125=3t^2+8t

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Solution for 125=3t^2+8t equation:


Simplifying
125 = 3t2 + 8t

Reorder the terms:
125 = 8t + 3t2

Solving
125 = 8t + 3t2

Solving for variable 't'.

Reorder the terms:
125 + -8t + -3t2 = 8t + -8t + 3t2 + -3t2

Combine like terms: 8t + -8t = 0
125 + -8t + -3t2 = 0 + 3t2 + -3t2
125 + -8t + -3t2 = 3t2 + -3t2

Combine like terms: 3t2 + -3t2 = 0
125 + -8t + -3t2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-41.66666667 + 2.666666667t + t2 = 0

Move the constant term to the right:

Add '41.66666667' to each side of the equation.
-41.66666667 + 2.666666667t + 41.66666667 + t2 = 0 + 41.66666667

Reorder the terms:
-41.66666667 + 41.66666667 + 2.666666667t + t2 = 0 + 41.66666667

Combine like terms: -41.66666667 + 41.66666667 = 0.00000000
0.00000000 + 2.666666667t + t2 = 0 + 41.66666667
2.666666667t + t2 = 0 + 41.66666667

Combine like terms: 0 + 41.66666667 = 41.66666667
2.666666667t + t2 = 41.66666667

The t term is 2.666666667t.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667t + 1.777777780 + t2 = 41.66666667 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667t + t2 = 41.66666667 + 1.777777780

Combine like terms: 41.66666667 + 1.777777780 = 43.44444445
1.777777780 + 2.666666667t + t2 = 43.44444445

Factor a perfect square on the left side:
(t + 1.333333334)(t + 1.333333334) = 43.44444445

Calculate the square root of the right side: 6.591239978

Break this problem into two subproblems by setting 
(t + 1.333333334) equal to 6.591239978 and -6.591239978.

Subproblem 1

t + 1.333333334 = 6.591239978 Simplifying t + 1.333333334 = 6.591239978 Reorder the terms: 1.333333334 + t = 6.591239978 Solving 1.333333334 + t = 6.591239978 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + t = 6.591239978 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + t = 6.591239978 + -1.333333334 t = 6.591239978 + -1.333333334 Combine like terms: 6.591239978 + -1.333333334 = 5.257906644 t = 5.257906644 Simplifying t = 5.257906644

Subproblem 2

t + 1.333333334 = -6.591239978 Simplifying t + 1.333333334 = -6.591239978 Reorder the terms: 1.333333334 + t = -6.591239978 Solving 1.333333334 + t = -6.591239978 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + t = -6.591239978 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + t = -6.591239978 + -1.333333334 t = -6.591239978 + -1.333333334 Combine like terms: -6.591239978 + -1.333333334 = -7.924573312 t = -7.924573312 Simplifying t = -7.924573312

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.257906644, -7.924573312}

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