t=-16t^2+70t+9

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Solution for t=-16t^2+70t+9 equation:


Simplifying
t = -16t2 + 70t + 9

Reorder the terms:
t = 9 + 70t + -16t2

Solving
t = 9 + 70t + -16t2

Solving for variable 't'.

Reorder the terms:
-9 + t + -70t + 16t2 = 9 + 70t + -16t2 + -9 + -70t + 16t2

Combine like terms: t + -70t = -69t
-9 + -69t + 16t2 = 9 + 70t + -16t2 + -9 + -70t + 16t2

Reorder the terms:
-9 + -69t + 16t2 = 9 + -9 + 70t + -70t + -16t2 + 16t2

Combine like terms: 9 + -9 = 0
-9 + -69t + 16t2 = 0 + 70t + -70t + -16t2 + 16t2
-9 + -69t + 16t2 = 70t + -70t + -16t2 + 16t2

Combine like terms: 70t + -70t = 0
-9 + -69t + 16t2 = 0 + -16t2 + 16t2
-9 + -69t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-9 + -69t + 16t2 = 0

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

Divide each side by '16'.
-0.5625 + -4.3125t + t2 = 0

Move the constant term to the right:

Add '0.5625' to each side of the equation.
-0.5625 + -4.3125t + 0.5625 + t2 = 0 + 0.5625

Reorder the terms:
-0.5625 + 0.5625 + -4.3125t + t2 = 0 + 0.5625

Combine like terms: -0.5625 + 0.5625 = 0.0000
0.0000 + -4.3125t + t2 = 0 + 0.5625
-4.3125t + t2 = 0 + 0.5625

Combine like terms: 0 + 0.5625 = 0.5625
-4.3125t + t2 = 0.5625

The t term is -4.3125t.  Take half its coefficient (-2.15625).
Square it (4.649414063) and add it to both sides.

Add '4.649414063' to each side of the equation.
-4.3125t + 4.649414063 + t2 = 0.5625 + 4.649414063

Reorder the terms:
4.649414063 + -4.3125t + t2 = 0.5625 + 4.649414063

Combine like terms: 0.5625 + 4.649414063 = 5.211914063
4.649414063 + -4.3125t + t2 = 5.211914063

Factor a perfect square on the left side:
(t + -2.15625)(t + -2.15625) = 5.211914063

Calculate the square root of the right side: 2.282961687

Break this problem into two subproblems by setting 
(t + -2.15625) equal to 2.282961687 and -2.282961687.

Subproblem 1

t + -2.15625 = 2.282961687 Simplifying t + -2.15625 = 2.282961687 Reorder the terms: -2.15625 + t = 2.282961687 Solving -2.15625 + t = 2.282961687 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.15625' to each side of the equation. -2.15625 + 2.15625 + t = 2.282961687 + 2.15625 Combine like terms: -2.15625 + 2.15625 = 0.00000 0.00000 + t = 2.282961687 + 2.15625 t = 2.282961687 + 2.15625 Combine like terms: 2.282961687 + 2.15625 = 4.439211687 t = 4.439211687 Simplifying t = 4.439211687

Subproblem 2

t + -2.15625 = -2.282961687 Simplifying t + -2.15625 = -2.282961687 Reorder the terms: -2.15625 + t = -2.282961687 Solving -2.15625 + t = -2.282961687 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.15625' to each side of the equation. -2.15625 + 2.15625 + t = -2.282961687 + 2.15625 Combine like terms: -2.15625 + 2.15625 = 0.00000 0.00000 + t = -2.282961687 + 2.15625 t = -2.282961687 + 2.15625 Combine like terms: -2.282961687 + 2.15625 = -0.126711687 t = -0.126711687 Simplifying t = -0.126711687

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.439211687, -0.126711687}

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