12.5=t^2+3t

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Solution for 12.5=t^2+3t equation:


Simplifying
12.5 = t2 + 3t

Reorder the terms:
12.5 = 3t + t2

Solving
12.5 = 3t + t2

Solving for variable 't'.

Reorder the terms:
12.5 + -3t + -1t2 = 3t + -3t + t2 + -1t2

Combine like terms: 3t + -3t = 0
12.5 + -3t + -1t2 = 0 + t2 + -1t2
12.5 + -3t + -1t2 = t2 + -1t2

Combine like terms: t2 + -1t2 = 0
12.5 + -3t + -1t2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-12.5 + 3t + t2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + 3t + 12.5 + t2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + 3t + t2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + 3t + t2 = 0 + 12.5
3t + t2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
3t + t2 = 12.5

The t term is 3t.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3t + 2.25 + t2 = 12.5 + 2.25

Reorder the terms:
2.25 + 3t + t2 = 12.5 + 2.25

Combine like terms: 12.5 + 2.25 = 14.75
2.25 + 3t + t2 = 14.75

Factor a perfect square on the left side:
(t + 1.5)(t + 1.5) = 14.75

Calculate the square root of the right side: 3.840572874

Break this problem into two subproblems by setting 
(t + 1.5) equal to 3.840572874 and -3.840572874.

Subproblem 1

t + 1.5 = 3.840572874 Simplifying t + 1.5 = 3.840572874 Reorder the terms: 1.5 + t = 3.840572874 Solving 1.5 + t = 3.840572874 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + t = 3.840572874 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + t = 3.840572874 + -1.5 t = 3.840572874 + -1.5 Combine like terms: 3.840572874 + -1.5 = 2.340572874 t = 2.340572874 Simplifying t = 2.340572874

Subproblem 2

t + 1.5 = -3.840572874 Simplifying t + 1.5 = -3.840572874 Reorder the terms: 1.5 + t = -3.840572874 Solving 1.5 + t = -3.840572874 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + t = -3.840572874 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + t = -3.840572874 + -1.5 t = -3.840572874 + -1.5 Combine like terms: -3.840572874 + -1.5 = -5.340572874 t = -5.340572874 Simplifying t = -5.340572874

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.340572874, -5.340572874}

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