-16t^2+109t+90=0

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Solution for -16t^2+109t+90=0 equation:


Simplifying
-16t2 + 109t + 90 = 0

Reorder the terms:
90 + 109t + -16t2 = 0

Solving
90 + 109t + -16t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-16 the coefficient of the squared term: 

Divide each side by '-16'.
-5.625 + -6.8125t + t2 = 0

Move the constant term to the right:

Add '5.625' to each side of the equation.
-5.625 + -6.8125t + 5.625 + t2 = 0 + 5.625

Reorder the terms:
-5.625 + 5.625 + -6.8125t + t2 = 0 + 5.625

Combine like terms: -5.625 + 5.625 = 0.000
0.000 + -6.8125t + t2 = 0 + 5.625
-6.8125t + t2 = 0 + 5.625

Combine like terms: 0 + 5.625 = 5.625
-6.8125t + t2 = 5.625

The t term is -6.8125t.  Take half its coefficient (-3.40625).
Square it (11.60253906) and add it to both sides.

Add '11.60253906' to each side of the equation.
-6.8125t + 11.60253906 + t2 = 5.625 + 11.60253906

Reorder the terms:
11.60253906 + -6.8125t + t2 = 5.625 + 11.60253906

Combine like terms: 5.625 + 11.60253906 = 17.22753906
11.60253906 + -6.8125t + t2 = 17.22753906

Factor a perfect square on the left side:
(t + -3.40625)(t + -3.40625) = 17.22753906

Calculate the square root of the right side: 4.150607071

Break this problem into two subproblems by setting 
(t + -3.40625) equal to 4.150607071 and -4.150607071.

Subproblem 1

t + -3.40625 = 4.150607071 Simplifying t + -3.40625 = 4.150607071 Reorder the terms: -3.40625 + t = 4.150607071 Solving -3.40625 + t = 4.150607071 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.40625' to each side of the equation. -3.40625 + 3.40625 + t = 4.150607071 + 3.40625 Combine like terms: -3.40625 + 3.40625 = 0.00000 0.00000 + t = 4.150607071 + 3.40625 t = 4.150607071 + 3.40625 Combine like terms: 4.150607071 + 3.40625 = 7.556857071 t = 7.556857071 Simplifying t = 7.556857071

Subproblem 2

t + -3.40625 = -4.150607071 Simplifying t + -3.40625 = -4.150607071 Reorder the terms: -3.40625 + t = -4.150607071 Solving -3.40625 + t = -4.150607071 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.40625' to each side of the equation. -3.40625 + 3.40625 + t = -4.150607071 + 3.40625 Combine like terms: -3.40625 + 3.40625 = 0.00000 0.00000 + t = -4.150607071 + 3.40625 t = -4.150607071 + 3.40625 Combine like terms: -4.150607071 + 3.40625 = -0.744357071 t = -0.744357071 Simplifying t = -0.744357071

Solution

The solution to the problem is based on the solutions from the subproblems. t = {7.556857071, -0.744357071}

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