0=-4.9t^2-10t+120

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Solution for 0=-4.9t^2-10t+120 equation:


Simplifying
0 = -4.9t2 + -10t + 120

Reorder the terms:
0 = 120 + -10t + -4.9t2

Solving
0 = 120 + -10t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -120 = -120
-120 + 10t + 4.9t2 = 120 + -10t + -4.9t2 + -120 + 10t + 4.9t2

Reorder the terms:
-120 + 10t + 4.9t2 = 120 + -120 + -10t + 10t + -4.9t2 + 4.9t2

Combine like terms: 120 + -120 = 0
-120 + 10t + 4.9t2 = 0 + -10t + 10t + -4.9t2 + 4.9t2
-120 + 10t + 4.9t2 = -10t + 10t + -4.9t2 + 4.9t2

Combine like terms: -10t + 10t = 0
-120 + 10t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-120 + 10t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-120 + 10t + 4.9t2 = 0.0

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

Divide each side by '4.9'.
-24.48979592 + 2.040816327t + t2 = 0

Move the constant term to the right:

Add '24.48979592' to each side of the equation.
-24.48979592 + 2.040816327t + 24.48979592 + t2 = 0 + 24.48979592

Reorder the terms:
-24.48979592 + 24.48979592 + 2.040816327t + t2 = 0 + 24.48979592

Combine like terms: -24.48979592 + 24.48979592 = 0.00000000
0.00000000 + 2.040816327t + t2 = 0 + 24.48979592
2.040816327t + t2 = 0 + 24.48979592

Combine like terms: 0 + 24.48979592 = 24.48979592
2.040816327t + t2 = 24.48979592

The t term is 2.040816327t.  Take half its coefficient (1.020408164).
Square it (1.041232821) and add it to both sides.

Add '1.041232821' to each side of the equation.
2.040816327t + 1.041232821 + t2 = 24.48979592 + 1.041232821

Reorder the terms:
1.041232821 + 2.040816327t + t2 = 24.48979592 + 1.041232821

Combine like terms: 24.48979592 + 1.041232821 = 25.531028741
1.041232821 + 2.040816327t + t2 = 25.531028741

Factor a perfect square on the left side:
(t + 1.020408164)(t + 1.020408164) = 25.531028741

Calculate the square root of the right side: 5.052823838

Break this problem into two subproblems by setting 
(t + 1.020408164) equal to 5.052823838 and -5.052823838.

Subproblem 1

t + 1.020408164 = 5.052823838 Simplifying t + 1.020408164 = 5.052823838 Reorder the terms: 1.020408164 + t = 5.052823838 Solving 1.020408164 + t = 5.052823838 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.020408164' to each side of the equation. 1.020408164 + -1.020408164 + t = 5.052823838 + -1.020408164 Combine like terms: 1.020408164 + -1.020408164 = 0.000000000 0.000000000 + t = 5.052823838 + -1.020408164 t = 5.052823838 + -1.020408164 Combine like terms: 5.052823838 + -1.020408164 = 4.032415674 t = 4.032415674 Simplifying t = 4.032415674

Subproblem 2

t + 1.020408164 = -5.052823838 Simplifying t + 1.020408164 = -5.052823838 Reorder the terms: 1.020408164 + t = -5.052823838 Solving 1.020408164 + t = -5.052823838 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.020408164' to each side of the equation. 1.020408164 + -1.020408164 + t = -5.052823838 + -1.020408164 Combine like terms: 1.020408164 + -1.020408164 = 0.000000000 0.000000000 + t = -5.052823838 + -1.020408164 t = -5.052823838 + -1.020408164 Combine like terms: -5.052823838 + -1.020408164 = -6.073232002 t = -6.073232002 Simplifying t = -6.073232002

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.032415674, -6.073232002}

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