5t^2+30t+12=0

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Solution for 5t^2+30t+12=0 equation:


Simplifying
5t2 + 30t + 12 = 0

Reorder the terms:
12 + 30t + 5t2 = 0

Solving
12 + 30t + 5t2 = 0

Solving for variable 't'.

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

Divide each side by '5'.
2.4 + 6t + t2 = 0

Move the constant term to the right:

Add '-2.4' to each side of the equation.
2.4 + 6t + -2.4 + t2 = 0 + -2.4

Reorder the terms:
2.4 + -2.4 + 6t + t2 = 0 + -2.4

Combine like terms: 2.4 + -2.4 = 0.0
0.0 + 6t + t2 = 0 + -2.4
6t + t2 = 0 + -2.4

Combine like terms: 0 + -2.4 = -2.4
6t + t2 = -2.4

The t term is 6t.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6t + 9 + t2 = -2.4 + 9

Reorder the terms:
9 + 6t + t2 = -2.4 + 9

Combine like terms: -2.4 + 9 = 6.6
9 + 6t + t2 = 6.6

Factor a perfect square on the left side:
(t + 3)(t + 3) = 6.6

Calculate the square root of the right side: 2.569046516

Break this problem into two subproblems by setting 
(t + 3) equal to 2.569046516 and -2.569046516.

Subproblem 1

t + 3 = 2.569046516 Simplifying t + 3 = 2.569046516 Reorder the terms: 3 + t = 2.569046516 Solving 3 + t = 2.569046516 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + t = 2.569046516 + -3 Combine like terms: 3 + -3 = 0 0 + t = 2.569046516 + -3 t = 2.569046516 + -3 Combine like terms: 2.569046516 + -3 = -0.430953484 t = -0.430953484 Simplifying t = -0.430953484

Subproblem 2

t + 3 = -2.569046516 Simplifying t + 3 = -2.569046516 Reorder the terms: 3 + t = -2.569046516 Solving 3 + t = -2.569046516 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + t = -2.569046516 + -3 Combine like terms: 3 + -3 = 0 0 + t = -2.569046516 + -3 t = -2.569046516 + -3 Combine like terms: -2.569046516 + -3 = -5.569046516 t = -5.569046516 Simplifying t = -5.569046516

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-0.430953484, -5.569046516}

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