0=-4.9t^2+25t+16

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Solution for 0=-4.9t^2+25t+16 equation:


Simplifying
0 = -4.9t2 + 25t + 16

Reorder the terms:
0 = 16 + 25t + -4.9t2

Solving
0 = 16 + 25t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -16 = -16
-16 + -25t + 4.9t2 = 16 + 25t + -4.9t2 + -16 + -25t + 4.9t2

Reorder the terms:
-16 + -25t + 4.9t2 = 16 + -16 + 25t + -25t + -4.9t2 + 4.9t2

Combine like terms: 16 + -16 = 0
-16 + -25t + 4.9t2 = 0 + 25t + -25t + -4.9t2 + 4.9t2
-16 + -25t + 4.9t2 = 25t + -25t + -4.9t2 + 4.9t2

Combine like terms: 25t + -25t = 0
-16 + -25t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-16 + -25t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-16 + -25t + 4.9t2 = 0.0

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

Divide each side by '4.9'.
-3.265306122 + -5.102040816t + t2 = 0

Move the constant term to the right:

Add '3.265306122' to each side of the equation.
-3.265306122 + -5.102040816t + 3.265306122 + t2 = 0 + 3.265306122

Reorder the terms:
-3.265306122 + 3.265306122 + -5.102040816t + t2 = 0 + 3.265306122

Combine like terms: -3.265306122 + 3.265306122 = 0.000000000
0.000000000 + -5.102040816t + t2 = 0 + 3.265306122
-5.102040816t + t2 = 0 + 3.265306122

Combine like terms: 0 + 3.265306122 = 3.265306122
-5.102040816t + t2 = 3.265306122

The t term is -5.102040816t.  Take half its coefficient (-2.551020408).
Square it (6.507705122) and add it to both sides.

Add '6.507705122' to each side of the equation.
-5.102040816t + 6.507705122 + t2 = 3.265306122 + 6.507705122

Reorder the terms:
6.507705122 + -5.102040816t + t2 = 3.265306122 + 6.507705122

Combine like terms: 3.265306122 + 6.507705122 = 9.773011244
6.507705122 + -5.102040816t + t2 = 9.773011244

Factor a perfect square on the left side:
(t + -2.551020408)(t + -2.551020408) = 9.773011244

Calculate the square root of the right side: 3.126181576

Break this problem into two subproblems by setting 
(t + -2.551020408) equal to 3.126181576 and -3.126181576.

Subproblem 1

t + -2.551020408 = 3.126181576 Simplifying t + -2.551020408 = 3.126181576 Reorder the terms: -2.551020408 + t = 3.126181576 Solving -2.551020408 + t = 3.126181576 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.551020408' to each side of the equation. -2.551020408 + 2.551020408 + t = 3.126181576 + 2.551020408 Combine like terms: -2.551020408 + 2.551020408 = 0.000000000 0.000000000 + t = 3.126181576 + 2.551020408 t = 3.126181576 + 2.551020408 Combine like terms: 3.126181576 + 2.551020408 = 5.677201984 t = 5.677201984 Simplifying t = 5.677201984

Subproblem 2

t + -2.551020408 = -3.126181576 Simplifying t + -2.551020408 = -3.126181576 Reorder the terms: -2.551020408 + t = -3.126181576 Solving -2.551020408 + t = -3.126181576 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.551020408' to each side of the equation. -2.551020408 + 2.551020408 + t = -3.126181576 + 2.551020408 Combine like terms: -2.551020408 + 2.551020408 = 0.000000000 0.000000000 + t = -3.126181576 + 2.551020408 t = -3.126181576 + 2.551020408 Combine like terms: -3.126181576 + 2.551020408 = -0.575161168 t = -0.575161168 Simplifying t = -0.575161168

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.677201984, -0.575161168}

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