2t^2-11t-7=0

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Solution for 2t^2-11t-7=0 equation:


Simplifying
2t2 + -11t + -7 = 0

Reorder the terms:
-7 + -11t + 2t2 = 0

Solving
-7 + -11t + 2t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-3.5 + -5.5t + t2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + -5.5t + 3.5 + t2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + -5.5t + t2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + -5.5t + t2 = 0 + 3.5
-5.5t + t2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
-5.5t + t2 = 3.5

The t term is -5.5t.  Take half its coefficient (-2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
-5.5t + 7.5625 + t2 = 3.5 + 7.5625

Reorder the terms:
7.5625 + -5.5t + t2 = 3.5 + 7.5625

Combine like terms: 3.5 + 7.5625 = 11.0625
7.5625 + -5.5t + t2 = 11.0625

Factor a perfect square on the left side:
(t + -2.75)(t + -2.75) = 11.0625

Calculate the square root of the right side: 3.326033674

Break this problem into two subproblems by setting 
(t + -2.75) equal to 3.326033674 and -3.326033674.

Subproblem 1

t + -2.75 = 3.326033674 Simplifying t + -2.75 = 3.326033674 Reorder the terms: -2.75 + t = 3.326033674 Solving -2.75 + t = 3.326033674 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + t = 3.326033674 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + t = 3.326033674 + 2.75 t = 3.326033674 + 2.75 Combine like terms: 3.326033674 + 2.75 = 6.076033674 t = 6.076033674 Simplifying t = 6.076033674

Subproblem 2

t + -2.75 = -3.326033674 Simplifying t + -2.75 = -3.326033674 Reorder the terms: -2.75 + t = -3.326033674 Solving -2.75 + t = -3.326033674 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + t = -3.326033674 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + t = -3.326033674 + 2.75 t = -3.326033674 + 2.75 Combine like terms: -3.326033674 + 2.75 = -0.576033674 t = -0.576033674 Simplifying t = -0.576033674

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.076033674, -0.576033674}

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