t^2-5t=7

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Solution for t^2-5t=7 equation:


Simplifying
t2 + -5t = 7

Reorder the terms:
-5t + t2 = 7

Solving
-5t + t2 = 7

Solving for variable 't'.

Reorder the terms:
-7 + -5t + t2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + -5t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -5t + 7 + t2 = 0 + 7

Reorder the terms:
-7 + 7 + -5t + t2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -5t + t2 = 0 + 7
-5t + t2 = 0 + 7

Combine like terms: 0 + 7 = 7
-5t + t2 = 7

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 = 7 + 6.25

Reorder the terms:
6.25 + -5t + t2 = 7 + 6.25

Combine like terms: 7 + 6.25 = 13.25
6.25 + -5t + t2 = 13.25

Factor a perfect square on the left side:
(t + -2.5)(t + -2.5) = 13.25

Calculate the square root of the right side: 3.640054945

Break this problem into two subproblems by setting 
(t + -2.5) equal to 3.640054945 and -3.640054945.

Subproblem 1

t + -2.5 = 3.640054945 Simplifying t + -2.5 = 3.640054945 Reorder the terms: -2.5 + t = 3.640054945 Solving -2.5 + t = 3.640054945 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 = 3.640054945 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = 3.640054945 + 2.5 t = 3.640054945 + 2.5 Combine like terms: 3.640054945 + 2.5 = 6.140054945 t = 6.140054945 Simplifying t = 6.140054945

Subproblem 2

t + -2.5 = -3.640054945 Simplifying t + -2.5 = -3.640054945 Reorder the terms: -2.5 + t = -3.640054945 Solving -2.5 + t = -3.640054945 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 = -3.640054945 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = -3.640054945 + 2.5 t = -3.640054945 + 2.5 Combine like terms: -3.640054945 + 2.5 = -1.140054945 t = -1.140054945 Simplifying t = -1.140054945

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.140054945, -1.140054945}

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