t^2-5t=40

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Solution for t^2-5t=40 equation:


Simplifying
t2 + -5t = 40

Reorder the terms:
-5t + t2 = 40

Solving
-5t + t2 = 40

Solving for variable 't'.

Reorder the terms:
-40 + -5t + t2 = 40 + -40

Combine like terms: 40 + -40 = 0
-40 + -5t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -5t + 40 + t2 = 0 + 40

Reorder the terms:
-40 + 40 + -5t + t2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -5t + t2 = 0 + 40
-5t + t2 = 0 + 40

Combine like terms: 0 + 40 = 40
-5t + t2 = 40

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 = 40 + 6.25

Reorder the terms:
6.25 + -5t + t2 = 40 + 6.25

Combine like terms: 40 + 6.25 = 46.25
6.25 + -5t + t2 = 46.25

Factor a perfect square on the left side:
(t + -2.5)(t + -2.5) = 46.25

Calculate the square root of the right side: 6.800735254

Break this problem into two subproblems by setting 
(t + -2.5) equal to 6.800735254 and -6.800735254.

Subproblem 1

t + -2.5 = 6.800735254 Simplifying t + -2.5 = 6.800735254 Reorder the terms: -2.5 + t = 6.800735254 Solving -2.5 + t = 6.800735254 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 = 6.800735254 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = 6.800735254 + 2.5 t = 6.800735254 + 2.5 Combine like terms: 6.800735254 + 2.5 = 9.300735254 t = 9.300735254 Simplifying t = 9.300735254

Subproblem 2

t + -2.5 = -6.800735254 Simplifying t + -2.5 = -6.800735254 Reorder the terms: -2.5 + t = -6.800735254 Solving -2.5 + t = -6.800735254 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 = -6.800735254 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = -6.800735254 + 2.5 t = -6.800735254 + 2.5 Combine like terms: -6.800735254 + 2.5 = -4.300735254 t = -4.300735254 Simplifying t = -4.300735254

Solution

The solution to the problem is based on the solutions from the subproblems. t = {9.300735254, -4.300735254}

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