t^2-5t-28=0

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


Simplifying
t2 + -5t + -28 = 0

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

Solving
-28 + -5t + t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + -5t + 28 + t2 = 0 + 28

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

Combine like terms: -28 + 28 = 0
0 + -5t + t2 = 0 + 28
-5t + t2 = 0 + 28

Combine like terms: 0 + 28 = 28
-5t + t2 = 28

The t term is -5t.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5t + 6.25 + t2 = 28 + 6.25

Reorder the terms:
6.25 + -5t + t2 = 28 + 6.25

Combine like terms: 28 + 6.25 = 34.25
6.25 + -5t + t2 = 34.25

Factor a perfect square on the left side:
(t + -2.5)(t + -2.5) = 34.25

Calculate the square root of the right side: 5.852349955

Break this problem into two subproblems by setting 
(t + -2.5) equal to 5.852349955 and -5.852349955.

Subproblem 1

t + -2.5 = 5.852349955 Simplifying t + -2.5 = 5.852349955 Reorder the terms: -2.5 + t = 5.852349955 Solving -2.5 + t = 5.852349955 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + t = 5.852349955 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = 5.852349955 + 2.5 t = 5.852349955 + 2.5 Combine like terms: 5.852349955 + 2.5 = 8.352349955 t = 8.352349955 Simplifying t = 8.352349955

Subproblem 2

t + -2.5 = -5.852349955 Simplifying t + -2.5 = -5.852349955 Reorder the terms: -2.5 + t = -5.852349955 Solving -2.5 + t = -5.852349955 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + t = -5.852349955 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = -5.852349955 + 2.5 t = -5.852349955 + 2.5 Combine like terms: -5.852349955 + 2.5 = -3.352349955 t = -3.352349955 Simplifying t = -3.352349955

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.352349955, -3.352349955}

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