4*9t^2+15t-25=0

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Solution for 4*9t^2+15t-25=0 equation:


Simplifying
4 * 9t2 + 15t + -25 = 0

Multiply 4 * 9
36t2 + 15t + -25 = 0

Reorder the terms:
-25 + 15t + 36t2 = 0

Solving
-25 + 15t + 36t2 = 0

Solving for variable 't'.

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

Divide each side by '36'.
-0.6944444444 + 0.4166666667t + t2 = 0

Move the constant term to the right:

Add '0.6944444444' to each side of the equation.
-0.6944444444 + 0.4166666667t + 0.6944444444 + t2 = 0 + 0.6944444444

Reorder the terms:
-0.6944444444 + 0.6944444444 + 0.4166666667t + t2 = 0 + 0.6944444444

Combine like terms: -0.6944444444 + 0.6944444444 = 0.0000000000
0.0000000000 + 0.4166666667t + t2 = 0 + 0.6944444444
0.4166666667t + t2 = 0 + 0.6944444444

Combine like terms: 0 + 0.6944444444 = 0.6944444444
0.4166666667t + t2 = 0.6944444444

The t term is 0.4166666667t.  Take half its coefficient (0.2083333334).
Square it (0.04340277781) and add it to both sides.

Add '0.04340277781' to each side of the equation.
0.4166666667t + 0.04340277781 + t2 = 0.6944444444 + 0.04340277781

Reorder the terms:
0.04340277781 + 0.4166666667t + t2 = 0.6944444444 + 0.04340277781

Combine like terms: 0.6944444444 + 0.04340277781 = 0.73784722221
0.04340277781 + 0.4166666667t + t2 = 0.73784722221

Factor a perfect square on the left side:
(t + 0.2083333334)(t + 0.2083333334) = 0.73784722221

Calculate the square root of the right side: 0.858980339

Break this problem into two subproblems by setting 
(t + 0.2083333334) equal to 0.858980339 and -0.858980339.

Subproblem 1

t + 0.2083333334 = 0.858980339 Simplifying t + 0.2083333334 = 0.858980339 Reorder the terms: 0.2083333334 + t = 0.858980339 Solving 0.2083333334 + t = 0.858980339 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.2083333334' to each side of the equation. 0.2083333334 + -0.2083333334 + t = 0.858980339 + -0.2083333334 Combine like terms: 0.2083333334 + -0.2083333334 = 0.0000000000 0.0000000000 + t = 0.858980339 + -0.2083333334 t = 0.858980339 + -0.2083333334 Combine like terms: 0.858980339 + -0.2083333334 = 0.6506470056 t = 0.6506470056 Simplifying t = 0.6506470056

Subproblem 2

t + 0.2083333334 = -0.858980339 Simplifying t + 0.2083333334 = -0.858980339 Reorder the terms: 0.2083333334 + t = -0.858980339 Solving 0.2083333334 + t = -0.858980339 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.2083333334' to each side of the equation. 0.2083333334 + -0.2083333334 + t = -0.858980339 + -0.2083333334 Combine like terms: 0.2083333334 + -0.2083333334 = 0.0000000000 0.0000000000 + t = -0.858980339 + -0.2083333334 t = -0.858980339 + -0.2083333334 Combine like terms: -0.858980339 + -0.2083333334 = -1.0673136724 t = -1.0673136724 Simplifying t = -1.0673136724

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.6506470056, -1.0673136724}

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