4.9t^2-8t-30=0

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Solution for 4.9t^2-8t-30=0 equation:


Simplifying
4.9t2 + -8t + -30 = 0

Reorder the terms:
-30 + -8t + 4.9t2 = 0

Solving
-30 + -8t + 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'.
-6.12244898 + -1.632653061t + t2 = 0

Move the constant term to the right:

Add '6.12244898' to each side of the equation.
-6.12244898 + -1.632653061t + 6.12244898 + t2 = 0 + 6.12244898

Reorder the terms:
-6.12244898 + 6.12244898 + -1.632653061t + t2 = 0 + 6.12244898

Combine like terms: -6.12244898 + 6.12244898 = 0.00000000
0.00000000 + -1.632653061t + t2 = 0 + 6.12244898
-1.632653061t + t2 = 0 + 6.12244898

Combine like terms: 0 + 6.12244898 = 6.12244898
-1.632653061t + t2 = 6.12244898

The t term is -1.632653061t.  Take half its coefficient (-0.8163265305).
Square it (0.6663890044) and add it to both sides.

Add '0.6663890044' to each side of the equation.
-1.632653061t + 0.6663890044 + t2 = 6.12244898 + 0.6663890044

Reorder the terms:
0.6663890044 + -1.632653061t + t2 = 6.12244898 + 0.6663890044

Combine like terms: 6.12244898 + 0.6663890044 = 6.7888379844
0.6663890044 + -1.632653061t + t2 = 6.7888379844

Factor a perfect square on the left side:
(t + -0.8163265305)(t + -0.8163265305) = 6.7888379844

Calculate the square root of the right side: 2.605539864

Break this problem into two subproblems by setting 
(t + -0.8163265305) equal to 2.605539864 and -2.605539864.

Subproblem 1

t + -0.8163265305 = 2.605539864 Simplifying t + -0.8163265305 = 2.605539864 Reorder the terms: -0.8163265305 + t = 2.605539864 Solving -0.8163265305 + t = 2.605539864 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.8163265305' to each side of the equation. -0.8163265305 + 0.8163265305 + t = 2.605539864 + 0.8163265305 Combine like terms: -0.8163265305 + 0.8163265305 = 0.0000000000 0.0000000000 + t = 2.605539864 + 0.8163265305 t = 2.605539864 + 0.8163265305 Combine like terms: 2.605539864 + 0.8163265305 = 3.4218663945 t = 3.4218663945 Simplifying t = 3.4218663945

Subproblem 2

t + -0.8163265305 = -2.605539864 Simplifying t + -0.8163265305 = -2.605539864 Reorder the terms: -0.8163265305 + t = -2.605539864 Solving -0.8163265305 + t = -2.605539864 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.8163265305' to each side of the equation. -0.8163265305 + 0.8163265305 + t = -2.605539864 + 0.8163265305 Combine like terms: -0.8163265305 + 0.8163265305 = 0.0000000000 0.0000000000 + t = -2.605539864 + 0.8163265305 t = -2.605539864 + 0.8163265305 Combine like terms: -2.605539864 + 0.8163265305 = -1.7892133335 t = -1.7892133335 Simplifying t = -1.7892133335

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.4218663945, -1.7892133335}

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