1.86t^2-15t-25=0

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Solution for 1.86t^2-15t-25=0 equation:


Simplifying
1.86t2 + -15t + -25 = 0

Reorder the terms:
-25 + -15t + 1.86t2 = 0

Solving
-25 + -15t + 1.86t2 = 0

Solving for variable 't'.

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

Divide each side by '1.86'.
-13.44086022 + -8.064516129t + t2 = 0

Move the constant term to the right:

Add '13.44086022' to each side of the equation.
-13.44086022 + -8.064516129t + 13.44086022 + t2 = 0 + 13.44086022

Reorder the terms:
-13.44086022 + 13.44086022 + -8.064516129t + t2 = 0 + 13.44086022

Combine like terms: -13.44086022 + 13.44086022 = 0.00000000
0.00000000 + -8.064516129t + t2 = 0 + 13.44086022
-8.064516129t + t2 = 0 + 13.44086022

Combine like terms: 0 + 13.44086022 = 13.44086022
-8.064516129t + t2 = 13.44086022

The t term is -8.064516129t.  Take half its coefficient (-4.032258065).
Square it (16.25910510) and add it to both sides.

Add '16.25910510' to each side of the equation.
-8.064516129t + 16.25910510 + t2 = 13.44086022 + 16.25910510

Reorder the terms:
16.25910510 + -8.064516129t + t2 = 13.44086022 + 16.25910510

Combine like terms: 13.44086022 + 16.25910510 = 29.69996532
16.25910510 + -8.064516129t + t2 = 29.69996532

Factor a perfect square on the left side:
(t + -4.032258065)(t + -4.032258065) = 29.69996532

Calculate the square root of the right side: 5.449767456

Break this problem into two subproblems by setting 
(t + -4.032258065) equal to 5.449767456 and -5.449767456.

Subproblem 1

t + -4.032258065 = 5.449767456 Simplifying t + -4.032258065 = 5.449767456 Reorder the terms: -4.032258065 + t = 5.449767456 Solving -4.032258065 + t = 5.449767456 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.032258065' to each side of the equation. -4.032258065 + 4.032258065 + t = 5.449767456 + 4.032258065 Combine like terms: -4.032258065 + 4.032258065 = 0.000000000 0.000000000 + t = 5.449767456 + 4.032258065 t = 5.449767456 + 4.032258065 Combine like terms: 5.449767456 + 4.032258065 = 9.482025521 t = 9.482025521 Simplifying t = 9.482025521

Subproblem 2

t + -4.032258065 = -5.449767456 Simplifying t + -4.032258065 = -5.449767456 Reorder the terms: -4.032258065 + t = -5.449767456 Solving -4.032258065 + t = -5.449767456 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.032258065' to each side of the equation. -4.032258065 + 4.032258065 + t = -5.449767456 + 4.032258065 Combine like terms: -4.032258065 + 4.032258065 = 0.000000000 0.000000000 + t = -5.449767456 + 4.032258065 t = -5.449767456 + 4.032258065 Combine like terms: -5.449767456 + 4.032258065 = -1.417509391 t = -1.417509391 Simplifying t = -1.417509391

Solution

The solution to the problem is based on the solutions from the subproblems. t = {9.482025521, -1.417509391}

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