2t^2-87t-90=0

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Solution for 2t^2-87t-90=0 equation:


Simplifying
2t2 + -87t + -90 = 0

Reorder the terms:
-90 + -87t + 2t2 = 0

Solving
-90 + -87t + 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'.
-45 + -43.5t + t2 = 0

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + -43.5t + 45 + t2 = 0 + 45

Reorder the terms:
-45 + 45 + -43.5t + t2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + -43.5t + t2 = 0 + 45
-43.5t + t2 = 0 + 45

Combine like terms: 0 + 45 = 45
-43.5t + t2 = 45

The t term is -43.5t.  Take half its coefficient (-21.75).
Square it (473.0625) and add it to both sides.

Add '473.0625' to each side of the equation.
-43.5t + 473.0625 + t2 = 45 + 473.0625

Reorder the terms:
473.0625 + -43.5t + t2 = 45 + 473.0625

Combine like terms: 45 + 473.0625 = 518.0625
473.0625 + -43.5t + t2 = 518.0625

Factor a perfect square on the left side:
(t + -21.75)(t + -21.75) = 518.0625

Calculate the square root of the right side: 22.760986358

Break this problem into two subproblems by setting 
(t + -21.75) equal to 22.760986358 and -22.760986358.

Subproblem 1

t + -21.75 = 22.760986358 Simplifying t + -21.75 = 22.760986358 Reorder the terms: -21.75 + t = 22.760986358 Solving -21.75 + t = 22.760986358 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '21.75' to each side of the equation. -21.75 + 21.75 + t = 22.760986358 + 21.75 Combine like terms: -21.75 + 21.75 = 0.00 0.00 + t = 22.760986358 + 21.75 t = 22.760986358 + 21.75 Combine like terms: 22.760986358 + 21.75 = 44.510986358 t = 44.510986358 Simplifying t = 44.510986358

Subproblem 2

t + -21.75 = -22.760986358 Simplifying t + -21.75 = -22.760986358 Reorder the terms: -21.75 + t = -22.760986358 Solving -21.75 + t = -22.760986358 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '21.75' to each side of the equation. -21.75 + 21.75 + t = -22.760986358 + 21.75 Combine like terms: -21.75 + 21.75 = 0.00 0.00 + t = -22.760986358 + 21.75 t = -22.760986358 + 21.75 Combine like terms: -22.760986358 + 21.75 = -1.010986358 t = -1.010986358 Simplifying t = -1.010986358

Solution

The solution to the problem is based on the solutions from the subproblems. t = {44.510986358, -1.010986358}

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