0=-5t^2-4t+120

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Solution for 0=-5t^2-4t+120 equation:


Simplifying
0 = -5t2 + -4t + 120

Reorder the terms:
0 = 120 + -4t + -5t2

Solving
0 = 120 + -4t + -5t2

Solving for variable 't'.

Combine like terms: 0 + -120 = -120
-120 + 4t + 5t2 = 120 + -4t + -5t2 + -120 + 4t + 5t2

Reorder the terms:
-120 + 4t + 5t2 = 120 + -120 + -4t + 4t + -5t2 + 5t2

Combine like terms: 120 + -120 = 0
-120 + 4t + 5t2 = 0 + -4t + 4t + -5t2 + 5t2
-120 + 4t + 5t2 = -4t + 4t + -5t2 + 5t2

Combine like terms: -4t + 4t = 0
-120 + 4t + 5t2 = 0 + -5t2 + 5t2
-120 + 4t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
-120 + 4t + 5t2 = 0

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

Divide each side by '5'.
-24 + 0.8t + t2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 0.8t + 24 + t2 = 0 + 24

Reorder the terms:
-24 + 24 + 0.8t + t2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 0.8t + t2 = 0 + 24
0.8t + t2 = 0 + 24

Combine like terms: 0 + 24 = 24
0.8t + t2 = 24

The t term is 0.8t.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8t + 0.16 + t2 = 24 + 0.16

Reorder the terms:
0.16 + 0.8t + t2 = 24 + 0.16

Combine like terms: 24 + 0.16 = 24.16
0.16 + 0.8t + t2 = 24.16

Factor a perfect square on the left side:
(t + 0.4)(t + 0.4) = 24.16

Calculate the square root of the right side: 4.915282291

Break this problem into two subproblems by setting 
(t + 0.4) equal to 4.915282291 and -4.915282291.

Subproblem 1

t + 0.4 = 4.915282291 Simplifying t + 0.4 = 4.915282291 Reorder the terms: 0.4 + t = 4.915282291 Solving 0.4 + t = 4.915282291 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + t = 4.915282291 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + t = 4.915282291 + -0.4 t = 4.915282291 + -0.4 Combine like terms: 4.915282291 + -0.4 = 4.515282291 t = 4.515282291 Simplifying t = 4.515282291

Subproblem 2

t + 0.4 = -4.915282291 Simplifying t + 0.4 = -4.915282291 Reorder the terms: 0.4 + t = -4.915282291 Solving 0.4 + t = -4.915282291 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + t = -4.915282291 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + t = -4.915282291 + -0.4 t = -4.915282291 + -0.4 Combine like terms: -4.915282291 + -0.4 = -5.315282291 t = -5.315282291 Simplifying t = -5.315282291

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.515282291, -5.315282291}

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