4t^2-5t-60=0

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Solution for 4t^2-5t-60=0 equation:


Simplifying
4t2 + -5t + -60 = 0

Reorder the terms:
-60 + -5t + 4t2 = 0

Solving
-60 + -5t + 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'.
-15 + -1.25t + t2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -1.25t + 15 + t2 = 0 + 15

Reorder the terms:
-15 + 15 + -1.25t + t2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -1.25t + t2 = 0 + 15
-1.25t + t2 = 0 + 15

Combine like terms: 0 + 15 = 15
-1.25t + t2 = 15

The t term is -1.25t.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25t + 0.390625 + t2 = 15 + 0.390625

Reorder the terms:
0.390625 + -1.25t + t2 = 15 + 0.390625

Combine like terms: 15 + 0.390625 = 15.390625
0.390625 + -1.25t + t2 = 15.390625

Factor a perfect square on the left side:
(t + -0.625)(t + -0.625) = 15.390625

Calculate the square root of the right side: 3.923088707

Break this problem into two subproblems by setting 
(t + -0.625) equal to 3.923088707 and -3.923088707.

Subproblem 1

t + -0.625 = 3.923088707 Simplifying t + -0.625 = 3.923088707 Reorder the terms: -0.625 + t = 3.923088707 Solving -0.625 + t = 3.923088707 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = 3.923088707 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = 3.923088707 + 0.625 t = 3.923088707 + 0.625 Combine like terms: 3.923088707 + 0.625 = 4.548088707 t = 4.548088707 Simplifying t = 4.548088707

Subproblem 2

t + -0.625 = -3.923088707 Simplifying t + -0.625 = -3.923088707 Reorder the terms: -0.625 + t = -3.923088707 Solving -0.625 + t = -3.923088707 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = -3.923088707 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = -3.923088707 + 0.625 t = -3.923088707 + 0.625 Combine like terms: -3.923088707 + 0.625 = -3.298088707 t = -3.298088707 Simplifying t = -3.298088707

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.548088707, -3.298088707}

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