4.9t^2-15t-12=0

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Solution for 4.9t^2-15t-12=0 equation:


Simplifying
4.9t2 + -15t + -12 = 0

Reorder the terms:
-12 + -15t + 4.9t2 = 0

Solving
-12 + -15t + 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'.
-2.448979592 + -3.06122449t + t2 = 0

Move the constant term to the right:

Add '2.448979592' to each side of the equation.
-2.448979592 + -3.06122449t + 2.448979592 + t2 = 0 + 2.448979592

Reorder the terms:
-2.448979592 + 2.448979592 + -3.06122449t + t2 = 0 + 2.448979592

Combine like terms: -2.448979592 + 2.448979592 = 0.000000000
0.000000000 + -3.06122449t + t2 = 0 + 2.448979592
-3.06122449t + t2 = 0 + 2.448979592

Combine like terms: 0 + 2.448979592 = 2.448979592
-3.06122449t + t2 = 2.448979592

The t term is -3.06122449t.  Take half its coefficient (-1.530612245).
Square it (2.342773845) and add it to both sides.

Add '2.342773845' to each side of the equation.
-3.06122449t + 2.342773845 + t2 = 2.448979592 + 2.342773845

Reorder the terms:
2.342773845 + -3.06122449t + t2 = 2.448979592 + 2.342773845

Combine like terms: 2.448979592 + 2.342773845 = 4.791753437
2.342773845 + -3.06122449t + t2 = 4.791753437

Factor a perfect square on the left side:
(t + -1.530612245)(t + -1.530612245) = 4.791753437

Calculate the square root of the right side: 2.189007409

Break this problem into two subproblems by setting 
(t + -1.530612245) equal to 2.189007409 and -2.189007409.

Subproblem 1

t + -1.530612245 = 2.189007409 Simplifying t + -1.530612245 = 2.189007409 Reorder the terms: -1.530612245 + t = 2.189007409 Solving -1.530612245 + t = 2.189007409 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.530612245' to each side of the equation. -1.530612245 + 1.530612245 + t = 2.189007409 + 1.530612245 Combine like terms: -1.530612245 + 1.530612245 = 0.000000000 0.000000000 + t = 2.189007409 + 1.530612245 t = 2.189007409 + 1.530612245 Combine like terms: 2.189007409 + 1.530612245 = 3.719619654 t = 3.719619654 Simplifying t = 3.719619654

Subproblem 2

t + -1.530612245 = -2.189007409 Simplifying t + -1.530612245 = -2.189007409 Reorder the terms: -1.530612245 + t = -2.189007409 Solving -1.530612245 + t = -2.189007409 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.530612245' to each side of the equation. -1.530612245 + 1.530612245 + t = -2.189007409 + 1.530612245 Combine like terms: -1.530612245 + 1.530612245 = 0.000000000 0.000000000 + t = -2.189007409 + 1.530612245 t = -2.189007409 + 1.530612245 Combine like terms: -2.189007409 + 1.530612245 = -0.658395164 t = -0.658395164 Simplifying t = -0.658395164

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.719619654, -0.658395164}

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