t^2+80t=68

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Solution for t^2+80t=68 equation:


Simplifying
t2 + 80t = 68

Reorder the terms:
80t + t2 = 68

Solving
80t + t2 = 68

Solving for variable 't'.

Reorder the terms:
-68 + 80t + t2 = 68 + -68

Combine like terms: 68 + -68 = 0
-68 + 80t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '68' to each side of the equation.
-68 + 80t + 68 + t2 = 0 + 68

Reorder the terms:
-68 + 68 + 80t + t2 = 0 + 68

Combine like terms: -68 + 68 = 0
0 + 80t + t2 = 0 + 68
80t + t2 = 0 + 68

Combine like terms: 0 + 68 = 68
80t + t2 = 68

The t term is 80t.  Take half its coefficient (40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
80t + 1600 + t2 = 68 + 1600

Reorder the terms:
1600 + 80t + t2 = 68 + 1600

Combine like terms: 68 + 1600 = 1668
1600 + 80t + t2 = 1668

Factor a perfect square on the left side:
(t + 40)(t + 40) = 1668

Calculate the square root of the right side: 40.841155713

Break this problem into two subproblems by setting 
(t + 40) equal to 40.841155713 and -40.841155713.

Subproblem 1

t + 40 = 40.841155713 Simplifying t + 40 = 40.841155713 Reorder the terms: 40 + t = 40.841155713 Solving 40 + t = 40.841155713 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + t = 40.841155713 + -40 Combine like terms: 40 + -40 = 0 0 + t = 40.841155713 + -40 t = 40.841155713 + -40 Combine like terms: 40.841155713 + -40 = 0.841155713 t = 0.841155713 Simplifying t = 0.841155713

Subproblem 2

t + 40 = -40.841155713 Simplifying t + 40 = -40.841155713 Reorder the terms: 40 + t = -40.841155713 Solving 40 + t = -40.841155713 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + t = -40.841155713 + -40 Combine like terms: 40 + -40 = 0 0 + t = -40.841155713 + -40 t = -40.841155713 + -40 Combine like terms: -40.841155713 + -40 = -80.841155713 t = -80.841155713 Simplifying t = -80.841155713

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.841155713, -80.841155713}

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