0=-16t^2+215t+40

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Solution for 0=-16t^2+215t+40 equation:


Simplifying
0 = -16t2 + 215t + 40

Reorder the terms:
0 = 40 + 215t + -16t2

Solving
0 = 40 + 215t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -40 = -40
-40 + -215t + 16t2 = 40 + 215t + -16t2 + -40 + -215t + 16t2

Reorder the terms:
-40 + -215t + 16t2 = 40 + -40 + 215t + -215t + -16t2 + 16t2

Combine like terms: 40 + -40 = 0
-40 + -215t + 16t2 = 0 + 215t + -215t + -16t2 + 16t2
-40 + -215t + 16t2 = 215t + -215t + -16t2 + 16t2

Combine like terms: 215t + -215t = 0
-40 + -215t + 16t2 = 0 + -16t2 + 16t2
-40 + -215t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-40 + -215t + 16t2 = 0

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

Divide each side by '16'.
-2.5 + -13.4375t + t2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -13.4375t + 2.5 + t2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -13.4375t + t2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -13.4375t + t2 = 0 + 2.5
-13.4375t + t2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-13.4375t + t2 = 2.5

The t term is -13.4375t.  Take half its coefficient (-6.71875).
Square it (45.14160156) and add it to both sides.

Add '45.14160156' to each side of the equation.
-13.4375t + 45.14160156 + t2 = 2.5 + 45.14160156

Reorder the terms:
45.14160156 + -13.4375t + t2 = 2.5 + 45.14160156

Combine like terms: 2.5 + 45.14160156 = 47.64160156
45.14160156 + -13.4375t + t2 = 47.64160156

Factor a perfect square on the left side:
(t + -6.71875)(t + -6.71875) = 47.64160156

Calculate the square root of the right side: 6.902289588

Break this problem into two subproblems by setting 
(t + -6.71875) equal to 6.902289588 and -6.902289588.

Subproblem 1

t + -6.71875 = 6.902289588 Simplifying t + -6.71875 = 6.902289588 Reorder the terms: -6.71875 + t = 6.902289588 Solving -6.71875 + t = 6.902289588 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6.71875' to each side of the equation. -6.71875 + 6.71875 + t = 6.902289588 + 6.71875 Combine like terms: -6.71875 + 6.71875 = 0.00000 0.00000 + t = 6.902289588 + 6.71875 t = 6.902289588 + 6.71875 Combine like terms: 6.902289588 + 6.71875 = 13.621039588 t = 13.621039588 Simplifying t = 13.621039588

Subproblem 2

t + -6.71875 = -6.902289588 Simplifying t + -6.71875 = -6.902289588 Reorder the terms: -6.71875 + t = -6.902289588 Solving -6.71875 + t = -6.902289588 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6.71875' to each side of the equation. -6.71875 + 6.71875 + t = -6.902289588 + 6.71875 Combine like terms: -6.71875 + 6.71875 = 0.00000 0.00000 + t = -6.902289588 + 6.71875 t = -6.902289588 + 6.71875 Combine like terms: -6.902289588 + 6.71875 = -0.183539588 t = -0.183539588 Simplifying t = -0.183539588

Solution

The solution to the problem is based on the solutions from the subproblems. t = {13.621039588, -0.183539588}

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