-16t^2-40t+9=0

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Solution for -16t^2-40t+9=0 equation:


Simplifying
-16t2 + -40t + 9 = 0

Reorder the terms:
9 + -40t + -16t2 = 0

Solving
9 + -40t + -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'.
-0.5625 + 2.5t + t2 = 0

Move the constant term to the right:

Add '0.5625' to each side of the equation.
-0.5625 + 2.5t + 0.5625 + t2 = 0 + 0.5625

Reorder the terms:
-0.5625 + 0.5625 + 2.5t + t2 = 0 + 0.5625

Combine like terms: -0.5625 + 0.5625 = 0.0000
0.0000 + 2.5t + t2 = 0 + 0.5625
2.5t + t2 = 0 + 0.5625

Combine like terms: 0 + 0.5625 = 0.5625
2.5t + t2 = 0.5625

The t term is 2.5t.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5t + 1.5625 + t2 = 0.5625 + 1.5625

Reorder the terms:
1.5625 + 2.5t + t2 = 0.5625 + 1.5625

Combine like terms: 0.5625 + 1.5625 = 2.125
1.5625 + 2.5t + t2 = 2.125

Factor a perfect square on the left side:
(t + 1.25)(t + 1.25) = 2.125

Calculate the square root of the right side: 1.457737974

Break this problem into two subproblems by setting 
(t + 1.25) equal to 1.457737974 and -1.457737974.

Subproblem 1

t + 1.25 = 1.457737974 Simplifying t + 1.25 = 1.457737974 Reorder the terms: 1.25 + t = 1.457737974 Solving 1.25 + t = 1.457737974 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + t = 1.457737974 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + t = 1.457737974 + -1.25 t = 1.457737974 + -1.25 Combine like terms: 1.457737974 + -1.25 = 0.207737974 t = 0.207737974 Simplifying t = 0.207737974

Subproblem 2

t + 1.25 = -1.457737974 Simplifying t + 1.25 = -1.457737974 Reorder the terms: 1.25 + t = -1.457737974 Solving 1.25 + t = -1.457737974 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + t = -1.457737974 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + t = -1.457737974 + -1.25 t = -1.457737974 + -1.25 Combine like terms: -1.457737974 + -1.25 = -2.707737974 t = -2.707737974 Simplifying t = -2.707737974

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.207737974, -2.707737974}

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