5t^2-6t-28=0

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Solution for 5t^2-6t-28=0 equation:


Simplifying
5t2 + -6t + -28 = 0

Reorder the terms:
-28 + -6t + 5t2 = 0

Solving
-28 + -6t + 5t2 = 0

Solving for variable 't'.

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

Divide each side by '5'.
-5.6 + -1.2t + t2 = 0

Move the constant term to the right:

Add '5.6' to each side of the equation.
-5.6 + -1.2t + 5.6 + t2 = 0 + 5.6

Reorder the terms:
-5.6 + 5.6 + -1.2t + t2 = 0 + 5.6

Combine like terms: -5.6 + 5.6 = 0.0
0.0 + -1.2t + t2 = 0 + 5.6
-1.2t + t2 = 0 + 5.6

Combine like terms: 0 + 5.6 = 5.6
-1.2t + t2 = 5.6

The t term is -1.2t.  Take half its coefficient (-0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
-1.2t + 0.36 + t2 = 5.6 + 0.36

Reorder the terms:
0.36 + -1.2t + t2 = 5.6 + 0.36

Combine like terms: 5.6 + 0.36 = 5.96
0.36 + -1.2t + t2 = 5.96

Factor a perfect square on the left side:
(t + -0.6)(t + -0.6) = 5.96

Calculate the square root of the right side: 2.441311123

Break this problem into two subproblems by setting 
(t + -0.6) equal to 2.441311123 and -2.441311123.

Subproblem 1

t + -0.6 = 2.441311123 Simplifying t + -0.6 = 2.441311123 Reorder the terms: -0.6 + t = 2.441311123 Solving -0.6 + t = 2.441311123 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + t = 2.441311123 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + t = 2.441311123 + 0.6 t = 2.441311123 + 0.6 Combine like terms: 2.441311123 + 0.6 = 3.041311123 t = 3.041311123 Simplifying t = 3.041311123

Subproblem 2

t + -0.6 = -2.441311123 Simplifying t + -0.6 = -2.441311123 Reorder the terms: -0.6 + t = -2.441311123 Solving -0.6 + t = -2.441311123 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + t = -2.441311123 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + t = -2.441311123 + 0.6 t = -2.441311123 + 0.6 Combine like terms: -2.441311123 + 0.6 = -1.841311123 t = -1.841311123 Simplifying t = -1.841311123

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.041311123, -1.841311123}

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