2.5t+4.9t^2-120=0

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Solution for 2.5t+4.9t^2-120=0 equation:


Simplifying
2.5t + 4.9t2 + -120 = 0

Reorder the terms:
-120 + 2.5t + 4.9t2 = 0

Solving
-120 + 2.5t + 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 + 0.5102040816t + t2 = 0

Move the constant term to the right:

Add '24.48979592' to each side of the equation.
-24.48979592 + 0.5102040816t + 24.48979592 + t2 = 0 + 24.48979592

Reorder the terms:
-24.48979592 + 24.48979592 + 0.5102040816t + t2 = 0 + 24.48979592

Combine like terms: -24.48979592 + 24.48979592 = 0.00000000
0.00000000 + 0.5102040816t + t2 = 0 + 24.48979592
0.5102040816t + t2 = 0 + 24.48979592

Combine like terms: 0 + 24.48979592 = 24.48979592
0.5102040816t + t2 = 24.48979592

The t term is 0.5102040816t.  Take half its coefficient (0.2551020408).
Square it (0.06507705122) and add it to both sides.

Add '0.06507705122' to each side of the equation.
0.5102040816t + 0.06507705122 + t2 = 24.48979592 + 0.06507705122

Reorder the terms:
0.06507705122 + 0.5102040816t + t2 = 24.48979592 + 0.06507705122

Combine like terms: 24.48979592 + 0.06507705122 = 24.55487297122
0.06507705122 + 0.5102040816t + t2 = 24.55487297122

Factor a perfect square on the left side:
(t + 0.2551020408)(t + 0.2551020408) = 24.55487297122

Calculate the square root of the right side: 4.955287375

Break this problem into two subproblems by setting 
(t + 0.2551020408) equal to 4.955287375 and -4.955287375.

Subproblem 1

t + 0.2551020408 = 4.955287375 Simplifying t + 0.2551020408 = 4.955287375 Reorder the terms: 0.2551020408 + t = 4.955287375 Solving 0.2551020408 + t = 4.955287375 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.2551020408' to each side of the equation. 0.2551020408 + -0.2551020408 + t = 4.955287375 + -0.2551020408 Combine like terms: 0.2551020408 + -0.2551020408 = 0.0000000000 0.0000000000 + t = 4.955287375 + -0.2551020408 t = 4.955287375 + -0.2551020408 Combine like terms: 4.955287375 + -0.2551020408 = 4.7001853342 t = 4.7001853342 Simplifying t = 4.7001853342

Subproblem 2

t + 0.2551020408 = -4.955287375 Simplifying t + 0.2551020408 = -4.955287375 Reorder the terms: 0.2551020408 + t = -4.955287375 Solving 0.2551020408 + t = -4.955287375 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.2551020408' to each side of the equation. 0.2551020408 + -0.2551020408 + t = -4.955287375 + -0.2551020408 Combine like terms: 0.2551020408 + -0.2551020408 = 0.0000000000 0.0000000000 + t = -4.955287375 + -0.2551020408 t = -4.955287375 + -0.2551020408 Combine like terms: -4.955287375 + -0.2551020408 = -5.2103894158 t = -5.2103894158 Simplifying t = -5.2103894158

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.7001853342, -5.2103894158}

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