-3t^2+4t+9=0

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Solution for -3t^2+4t+9=0 equation:


Simplifying
-3t2 + 4t + 9 = 0

Reorder the terms:
9 + 4t + -3t2 = 0

Solving
9 + 4t + -3t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-3 + -1.333333333t + t2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -1.333333333t + 3 + t2 = 0 + 3

Reorder the terms:
-3 + 3 + -1.333333333t + t2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1.333333333t + t2 = 0 + 3
-1.333333333t + t2 = 0 + 3

Combine like terms: 0 + 3 = 3
-1.333333333t + t2 = 3

The t term is -1.333333333t.  Take half its coefficient (-0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
-1.333333333t + 0.4444444442 + t2 = 3 + 0.4444444442

Reorder the terms:
0.4444444442 + -1.333333333t + t2 = 3 + 0.4444444442

Combine like terms: 3 + 0.4444444442 = 3.4444444442
0.4444444442 + -1.333333333t + t2 = 3.4444444442

Factor a perfect square on the left side:
(t + -0.6666666665)(t + -0.6666666665) = 3.4444444442

Calculate the square root of the right side: 1.855921454

Break this problem into two subproblems by setting 
(t + -0.6666666665) equal to 1.855921454 and -1.855921454.

Subproblem 1

t + -0.6666666665 = 1.855921454 Simplifying t + -0.6666666665 = 1.855921454 Reorder the terms: -0.6666666665 + t = 1.855921454 Solving -0.6666666665 + t = 1.855921454 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + t = 1.855921454 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + t = 1.855921454 + 0.6666666665 t = 1.855921454 + 0.6666666665 Combine like terms: 1.855921454 + 0.6666666665 = 2.5225881205 t = 2.5225881205 Simplifying t = 2.5225881205

Subproblem 2

t + -0.6666666665 = -1.855921454 Simplifying t + -0.6666666665 = -1.855921454 Reorder the terms: -0.6666666665 + t = -1.855921454 Solving -0.6666666665 + t = -1.855921454 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + t = -1.855921454 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + t = -1.855921454 + 0.6666666665 t = -1.855921454 + 0.6666666665 Combine like terms: -1.855921454 + 0.6666666665 = -1.1892547875 t = -1.1892547875 Simplifying t = -1.1892547875

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.5225881205, -1.1892547875}

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