4t^2-25t+15=0

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


Simplifying
4t2 + -25t + 15 = 0

Reorder the terms:
15 + -25t + 4t2 = 0

Solving
15 + -25t + 4t2 = 0

Solving for variable 't'.

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

Divide each side by '4'.
3.75 + -6.25t + t2 = 0

Move the constant term to the right:

Add '-3.75' to each side of the equation.
3.75 + -6.25t + -3.75 + t2 = 0 + -3.75

Reorder the terms:
3.75 + -3.75 + -6.25t + t2 = 0 + -3.75

Combine like terms: 3.75 + -3.75 = 0.00
0.00 + -6.25t + t2 = 0 + -3.75
-6.25t + t2 = 0 + -3.75

Combine like terms: 0 + -3.75 = -3.75
-6.25t + t2 = -3.75

The t term is -6.25t.  Take half its coefficient (-3.125).
Square it (9.765625) and add it to both sides.

Add '9.765625' to each side of the equation.
-6.25t + 9.765625 + t2 = -3.75 + 9.765625

Reorder the terms:
9.765625 + -6.25t + t2 = -3.75 + 9.765625

Combine like terms: -3.75 + 9.765625 = 6.015625
9.765625 + -6.25t + t2 = 6.015625

Factor a perfect square on the left side:
(t + -3.125)(t + -3.125) = 6.015625

Calculate the square root of the right side: 2.452677109

Break this problem into two subproblems by setting 
(t + -3.125) equal to 2.452677109 and -2.452677109.

Subproblem 1

t + -3.125 = 2.452677109 Simplifying t + -3.125 = 2.452677109 Reorder the terms: -3.125 + t = 2.452677109 Solving -3.125 + t = 2.452677109 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + t = 2.452677109 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + t = 2.452677109 + 3.125 t = 2.452677109 + 3.125 Combine like terms: 2.452677109 + 3.125 = 5.577677109 t = 5.577677109 Simplifying t = 5.577677109

Subproblem 2

t + -3.125 = -2.452677109 Simplifying t + -3.125 = -2.452677109 Reorder the terms: -3.125 + t = -2.452677109 Solving -3.125 + t = -2.452677109 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + t = -2.452677109 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + t = -2.452677109 + 3.125 t = -2.452677109 + 3.125 Combine like terms: -2.452677109 + 3.125 = 0.672322891 t = 0.672322891 Simplifying t = 0.672322891

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.577677109, 0.672322891}

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