4.9t^2-25t-15=0

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Solution for 4.9t^2-25t-15=0 equation:


Simplifying
4.9t2 + -25t + -15 = 0

Reorder the terms:
-15 + -25t + 4.9t2 = 0

Solving
-15 + -25t + 4.9t2 = 0

Solving for variable 't'.

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

Divide each side by '4.9'.
-3.06122449 + -5.102040816t + t2 = 0

Move the constant term to the right:

Add '3.06122449' to each side of the equation.
-3.06122449 + -5.102040816t + 3.06122449 + t2 = 0 + 3.06122449

Reorder the terms:
-3.06122449 + 3.06122449 + -5.102040816t + t2 = 0 + 3.06122449

Combine like terms: -3.06122449 + 3.06122449 = 0.00000000
0.00000000 + -5.102040816t + t2 = 0 + 3.06122449
-5.102040816t + t2 = 0 + 3.06122449

Combine like terms: 0 + 3.06122449 = 3.06122449
-5.102040816t + t2 = 3.06122449

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 = 3.06122449 + 6.507705122

Reorder the terms:
6.507705122 + -5.102040816t + t2 = 3.06122449 + 6.507705122

Combine like terms: 3.06122449 + 6.507705122 = 9.568929612
6.507705122 + -5.102040816t + t2 = 9.568929612

Factor a perfect square on the left side:
(t + -2.551020408)(t + -2.551020408) = 9.568929612

Calculate the square root of the right side: 3.093368651

Break this problem into two subproblems by setting 
(t + -2.551020408) equal to 3.093368651 and -3.093368651.

Subproblem 1

t + -2.551020408 = 3.093368651 Simplifying t + -2.551020408 = 3.093368651 Reorder the terms: -2.551020408 + t = 3.093368651 Solving -2.551020408 + t = 3.093368651 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 = 3.093368651 + 2.551020408 Combine like terms: -2.551020408 + 2.551020408 = 0.000000000 0.000000000 + t = 3.093368651 + 2.551020408 t = 3.093368651 + 2.551020408 Combine like terms: 3.093368651 + 2.551020408 = 5.644389059 t = 5.644389059 Simplifying t = 5.644389059

Subproblem 2

t + -2.551020408 = -3.093368651 Simplifying t + -2.551020408 = -3.093368651 Reorder the terms: -2.551020408 + t = -3.093368651 Solving -2.551020408 + t = -3.093368651 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 = -3.093368651 + 2.551020408 Combine like terms: -2.551020408 + 2.551020408 = 0.000000000 0.000000000 + t = -3.093368651 + 2.551020408 t = -3.093368651 + 2.551020408 Combine like terms: -3.093368651 + 2.551020408 = -0.542348243 t = -0.542348243 Simplifying t = -0.542348243

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.644389059, -0.542348243}

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