0=38+25t-4.9t^2

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Solution for 0=38+25t-4.9t^2 equation:


Simplifying
0 = 38 + 25t + -4.9t2

Solving
0 = 38 + 25t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -38 = -38
-38 + -25t + 4.9t2 = 38 + 25t + -4.9t2 + -38 + -25t + 4.9t2

Reorder the terms:
-38 + -25t + 4.9t2 = 38 + -38 + 25t + -25t + -4.9t2 + 4.9t2

Combine like terms: 38 + -38 = 0
-38 + -25t + 4.9t2 = 0 + 25t + -25t + -4.9t2 + 4.9t2
-38 + -25t + 4.9t2 = 25t + -25t + -4.9t2 + 4.9t2

Combine like terms: 25t + -25t = 0
-38 + -25t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-38 + -25t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-38 + -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'.
-7.755102041 + -5.102040816t + t2 = 0

Move the constant term to the right:

Add '7.755102041' to each side of the equation.
-7.755102041 + -5.102040816t + 7.755102041 + t2 = 0 + 7.755102041

Reorder the terms:
-7.755102041 + 7.755102041 + -5.102040816t + t2 = 0 + 7.755102041

Combine like terms: -7.755102041 + 7.755102041 = 0.000000000
0.000000000 + -5.102040816t + t2 = 0 + 7.755102041
-5.102040816t + t2 = 0 + 7.755102041

Combine like terms: 0 + 7.755102041 = 7.755102041
-5.102040816t + t2 = 7.755102041

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 = 7.755102041 + 6.507705122

Reorder the terms:
6.507705122 + -5.102040816t + t2 = 7.755102041 + 6.507705122

Combine like terms: 7.755102041 + 6.507705122 = 14.262807163
6.507705122 + -5.102040816t + t2 = 14.262807163

Factor a perfect square on the left side:
(t + -2.551020408)(t + -2.551020408) = 14.262807163

Calculate the square root of the right side: 3.776613187

Break this problem into two subproblems by setting 
(t + -2.551020408) equal to 3.776613187 and -3.776613187.

Subproblem 1

t + -2.551020408 = 3.776613187 Simplifying t + -2.551020408 = 3.776613187 Reorder the terms: -2.551020408 + t = 3.776613187 Solving -2.551020408 + t = 3.776613187 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 = 3.776613187 + 2.551020408 Combine like terms: -2.551020408 + 2.551020408 = 0.000000000 0.000000000 + t = 3.776613187 + 2.551020408 t = 3.776613187 + 2.551020408 Combine like terms: 3.776613187 + 2.551020408 = 6.327633595 t = 6.327633595 Simplifying t = 6.327633595

Subproblem 2

t + -2.551020408 = -3.776613187 Simplifying t + -2.551020408 = -3.776613187 Reorder the terms: -2.551020408 + t = -3.776613187 Solving -2.551020408 + t = -3.776613187 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 = -3.776613187 + 2.551020408 Combine like terms: -2.551020408 + 2.551020408 = 0.000000000 0.000000000 + t = -3.776613187 + 2.551020408 t = -3.776613187 + 2.551020408 Combine like terms: -3.776613187 + 2.551020408 = -1.225592779 t = -1.225592779 Simplifying t = -1.225592779

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.327633595, -1.225592779}

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