0=16t^2-15t-18

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Solution for 0=16t^2-15t-18 equation:


Simplifying
0 = 16t2 + -15t + -18

Reorder the terms:
0 = -18 + -15t + 16t2

Solving
0 = -18 + -15t + 16t2

Solving for variable 't'.

Combine like terms: 0 + 18 = 18
18 + 15t + -16t2 = -18 + -15t + 16t2 + 18 + 15t + -16t2

Reorder the terms:
18 + 15t + -16t2 = -18 + 18 + -15t + 15t + 16t2 + -16t2

Combine like terms: -18 + 18 = 0
18 + 15t + -16t2 = 0 + -15t + 15t + 16t2 + -16t2
18 + 15t + -16t2 = -15t + 15t + 16t2 + -16t2

Combine like terms: -15t + 15t = 0
18 + 15t + -16t2 = 0 + 16t2 + -16t2
18 + 15t + -16t2 = 16t2 + -16t2

Combine like terms: 16t2 + -16t2 = 0
18 + 15t + -16t2 = 0

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

Divide each side by '-16'.
-1.125 + -0.9375t + t2 = 0

Move the constant term to the right:

Add '1.125' to each side of the equation.
-1.125 + -0.9375t + 1.125 + t2 = 0 + 1.125

Reorder the terms:
-1.125 + 1.125 + -0.9375t + t2 = 0 + 1.125

Combine like terms: -1.125 + 1.125 = 0.000
0.000 + -0.9375t + t2 = 0 + 1.125
-0.9375t + t2 = 0 + 1.125

Combine like terms: 0 + 1.125 = 1.125
-0.9375t + t2 = 1.125

The t term is -0.9375t.  Take half its coefficient (-0.46875).
Square it (0.2197265625) and add it to both sides.

Add '0.2197265625' to each side of the equation.
-0.9375t + 0.2197265625 + t2 = 1.125 + 0.2197265625

Reorder the terms:
0.2197265625 + -0.9375t + t2 = 1.125 + 0.2197265625

Combine like terms: 1.125 + 0.2197265625 = 1.3447265625
0.2197265625 + -0.9375t + t2 = 1.3447265625

Factor a perfect square on the left side:
(t + -0.46875)(t + -0.46875) = 1.3447265625

Calculate the square root of the right side: 1.159623457

Break this problem into two subproblems by setting 
(t + -0.46875) equal to 1.159623457 and -1.159623457.

Subproblem 1

t + -0.46875 = 1.159623457 Simplifying t + -0.46875 = 1.159623457 Reorder the terms: -0.46875 + t = 1.159623457 Solving -0.46875 + t = 1.159623457 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.46875' to each side of the equation. -0.46875 + 0.46875 + t = 1.159623457 + 0.46875 Combine like terms: -0.46875 + 0.46875 = 0.00000 0.00000 + t = 1.159623457 + 0.46875 t = 1.159623457 + 0.46875 Combine like terms: 1.159623457 + 0.46875 = 1.628373457 t = 1.628373457 Simplifying t = 1.628373457

Subproblem 2

t + -0.46875 = -1.159623457 Simplifying t + -0.46875 = -1.159623457 Reorder the terms: -0.46875 + t = -1.159623457 Solving -0.46875 + t = -1.159623457 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.46875' to each side of the equation. -0.46875 + 0.46875 + t = -1.159623457 + 0.46875 Combine like terms: -0.46875 + 0.46875 = 0.00000 0.00000 + t = -1.159623457 + 0.46875 t = -1.159623457 + 0.46875 Combine like terms: -1.159623457 + 0.46875 = -0.690873457 t = -0.690873457 Simplifying t = -0.690873457

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.628373457, -0.690873457}

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