0.8t^2+12t-45=0

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Solution for 0.8t^2+12t-45=0 equation:


Simplifying
0.8t2 + 12t + -45 = 0

Reorder the terms:
-45 + 12t + 0.8t2 = 0

Solving
-45 + 12t + 0.8t2 = 0

Solving for variable 't'.

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

Divide each side by '0.8'.
-56.25 + 15t + t2 = 0

Move the constant term to the right:

Add '56.25' to each side of the equation.
-56.25 + 15t + 56.25 + t2 = 0 + 56.25

Reorder the terms:
-56.25 + 56.25 + 15t + t2 = 0 + 56.25

Combine like terms: -56.25 + 56.25 = 0.00
0.00 + 15t + t2 = 0 + 56.25
15t + t2 = 0 + 56.25

Combine like terms: 0 + 56.25 = 56.25
15t + t2 = 56.25

The t term is 15t.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15t + 56.25 + t2 = 56.25 + 56.25

Reorder the terms:
56.25 + 15t + t2 = 56.25 + 56.25

Combine like terms: 56.25 + 56.25 = 112.5
56.25 + 15t + t2 = 112.5

Factor a perfect square on the left side:
(t + 7.5)(t + 7.5) = 112.5

Calculate the square root of the right side: 10.606601718

Break this problem into two subproblems by setting 
(t + 7.5) equal to 10.606601718 and -10.606601718.

Subproblem 1

t + 7.5 = 10.606601718 Simplifying t + 7.5 = 10.606601718 Reorder the terms: 7.5 + t = 10.606601718 Solving 7.5 + t = 10.606601718 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + t = 10.606601718 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + t = 10.606601718 + -7.5 t = 10.606601718 + -7.5 Combine like terms: 10.606601718 + -7.5 = 3.106601718 t = 3.106601718 Simplifying t = 3.106601718

Subproblem 2

t + 7.5 = -10.606601718 Simplifying t + 7.5 = -10.606601718 Reorder the terms: 7.5 + t = -10.606601718 Solving 7.5 + t = -10.606601718 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + t = -10.606601718 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + t = -10.606601718 + -7.5 t = -10.606601718 + -7.5 Combine like terms: -10.606601718 + -7.5 = -18.106601718 t = -18.106601718 Simplifying t = -18.106601718

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.106601718, -18.106601718}

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