5t^2-12t-90=0

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Solution for 5t^2-12t-90=0 equation:


Simplifying
5t2 + -12t + -90 = 0

Reorder the terms:
-90 + -12t + 5t2 = 0

Solving
-90 + -12t + 5t2 = 0

Solving for variable 't'.

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

Divide each side by '5'.
-18 + -2.4t + t2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -2.4t + 18 + t2 = 0 + 18

Reorder the terms:
-18 + 18 + -2.4t + t2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -2.4t + t2 = 0 + 18
-2.4t + t2 = 0 + 18

Combine like terms: 0 + 18 = 18
-2.4t + t2 = 18

The t term is -2.4t.  Take half its coefficient (-1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
-2.4t + 1.44 + t2 = 18 + 1.44

Reorder the terms:
1.44 + -2.4t + t2 = 18 + 1.44

Combine like terms: 18 + 1.44 = 19.44
1.44 + -2.4t + t2 = 19.44

Factor a perfect square on the left side:
(t + -1.2)(t + -1.2) = 19.44

Calculate the square root of the right side: 4.409081537

Break this problem into two subproblems by setting 
(t + -1.2) equal to 4.409081537 and -4.409081537.

Subproblem 1

t + -1.2 = 4.409081537 Simplifying t + -1.2 = 4.409081537 Reorder the terms: -1.2 + t = 4.409081537 Solving -1.2 + t = 4.409081537 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + t = 4.409081537 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + t = 4.409081537 + 1.2 t = 4.409081537 + 1.2 Combine like terms: 4.409081537 + 1.2 = 5.609081537 t = 5.609081537 Simplifying t = 5.609081537

Subproblem 2

t + -1.2 = -4.409081537 Simplifying t + -1.2 = -4.409081537 Reorder the terms: -1.2 + t = -4.409081537 Solving -1.2 + t = -4.409081537 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + t = -4.409081537 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + t = -4.409081537 + 1.2 t = -4.409081537 + 1.2 Combine like terms: -4.409081537 + 1.2 = -3.209081537 t = -3.209081537 Simplifying t = -3.209081537

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.609081537, -3.209081537}

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