4.9t^2+25t-120=0

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Solution for 4.9t^2+25t-120=0 equation:


Simplifying
4.9t2 + 25t + -120 = 0

Reorder the terms:
-120 + 25t + 4.9t2 = 0

Solving
-120 + 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'.
-24.48979592 + 5.102040816t + t2 = 0

Move the constant term to the right:

Add '24.48979592' to each side of the equation.
-24.48979592 + 5.102040816t + 24.48979592 + t2 = 0 + 24.48979592

Reorder the terms:
-24.48979592 + 24.48979592 + 5.102040816t + t2 = 0 + 24.48979592

Combine like terms: -24.48979592 + 24.48979592 = 0.00000000
0.00000000 + 5.102040816t + t2 = 0 + 24.48979592
5.102040816t + t2 = 0 + 24.48979592

Combine like terms: 0 + 24.48979592 = 24.48979592
5.102040816t + t2 = 24.48979592

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 = 24.48979592 + 6.507705122

Reorder the terms:
6.507705122 + 5.102040816t + t2 = 24.48979592 + 6.507705122

Combine like terms: 24.48979592 + 6.507705122 = 30.997501042
6.507705122 + 5.102040816t + t2 = 30.997501042

Factor a perfect square on the left side:
(t + 2.551020408)(t + 2.551020408) = 30.997501042

Calculate the square root of the right side: 5.567539945

Break this problem into two subproblems by setting 
(t + 2.551020408) equal to 5.567539945 and -5.567539945.

Subproblem 1

t + 2.551020408 = 5.567539945 Simplifying t + 2.551020408 = 5.567539945 Reorder the terms: 2.551020408 + t = 5.567539945 Solving 2.551020408 + t = 5.567539945 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 = 5.567539945 + -2.551020408 Combine like terms: 2.551020408 + -2.551020408 = 0.000000000 0.000000000 + t = 5.567539945 + -2.551020408 t = 5.567539945 + -2.551020408 Combine like terms: 5.567539945 + -2.551020408 = 3.016519537 t = 3.016519537 Simplifying t = 3.016519537

Subproblem 2

t + 2.551020408 = -5.567539945 Simplifying t + 2.551020408 = -5.567539945 Reorder the terms: 2.551020408 + t = -5.567539945 Solving 2.551020408 + t = -5.567539945 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 = -5.567539945 + -2.551020408 Combine like terms: 2.551020408 + -2.551020408 = 0.000000000 0.000000000 + t = -5.567539945 + -2.551020408 t = -5.567539945 + -2.551020408 Combine like terms: -5.567539945 + -2.551020408 = -8.118560353 t = -8.118560353 Simplifying t = -8.118560353

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.016519537, -8.118560353}

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