t^2-40t-64=0

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Solution for t^2-40t-64=0 equation:


Simplifying
t2 + -40t + -64 = 0

Reorder the terms:
-64 + -40t + t2 = 0

Solving
-64 + -40t + t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + -40t + 64 + t2 = 0 + 64

Reorder the terms:
-64 + 64 + -40t + t2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + -40t + t2 = 0 + 64
-40t + t2 = 0 + 64

Combine like terms: 0 + 64 = 64
-40t + t2 = 64

The t term is -40t.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40t + 400 + t2 = 64 + 400

Reorder the terms:
400 + -40t + t2 = 64 + 400

Combine like terms: 64 + 400 = 464
400 + -40t + t2 = 464

Factor a perfect square on the left side:
(t + -20)(t + -20) = 464

Calculate the square root of the right side: 21.540659229

Break this problem into two subproblems by setting 
(t + -20) equal to 21.540659229 and -21.540659229.

Subproblem 1

t + -20 = 21.540659229 Simplifying t + -20 = 21.540659229 Reorder the terms: -20 + t = 21.540659229 Solving -20 + t = 21.540659229 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + t = 21.540659229 + 20 Combine like terms: -20 + 20 = 0 0 + t = 21.540659229 + 20 t = 21.540659229 + 20 Combine like terms: 21.540659229 + 20 = 41.540659229 t = 41.540659229 Simplifying t = 41.540659229

Subproblem 2

t + -20 = -21.540659229 Simplifying t + -20 = -21.540659229 Reorder the terms: -20 + t = -21.540659229 Solving -20 + t = -21.540659229 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + t = -21.540659229 + 20 Combine like terms: -20 + 20 = 0 0 + t = -21.540659229 + 20 t = -21.540659229 + 20 Combine like terms: -21.540659229 + 20 = -1.540659229 t = -1.540659229 Simplifying t = -1.540659229

Solution

The solution to the problem is based on the solutions from the subproblems. t = {41.540659229, -1.540659229}

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