12+18t-4.905t^2=0

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Solution for 12+18t-4.905t^2=0 equation:


Simplifying
12 + 18t + -4.905t2 = 0

Solving
12 + 18t + -4.905t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-4.905 the coefficient of the squared term: 

Divide each side by '-4.905'.
-2.44648318 + -3.669724771t + t2 = 0

Move the constant term to the right:

Add '2.44648318' to each side of the equation.
-2.44648318 + -3.669724771t + 2.44648318 + t2 = 0 + 2.44648318

Reorder the terms:
-2.44648318 + 2.44648318 + -3.669724771t + t2 = 0 + 2.44648318

Combine like terms: -2.44648318 + 2.44648318 = 0.00000000
0.00000000 + -3.669724771t + t2 = 0 + 2.44648318
-3.669724771t + t2 = 0 + 2.44648318

Combine like terms: 0 + 2.44648318 = 2.44648318
-3.669724771t + t2 = 2.44648318

The t term is -3.669724771t.  Take half its coefficient (-1.834862386).
Square it (3.366719976) and add it to both sides.

Add '3.366719976' to each side of the equation.
-3.669724771t + 3.366719976 + t2 = 2.44648318 + 3.366719976

Reorder the terms:
3.366719976 + -3.669724771t + t2 = 2.44648318 + 3.366719976

Combine like terms: 2.44648318 + 3.366719976 = 5.813203156
3.366719976 + -3.669724771t + t2 = 5.813203156

Factor a perfect square on the left side:
(t + -1.834862386)(t + -1.834862386) = 5.813203156

Calculate the square root of the right side: 2.411058514

Break this problem into two subproblems by setting 
(t + -1.834862386) equal to 2.411058514 and -2.411058514.

Subproblem 1

t + -1.834862386 = 2.411058514 Simplifying t + -1.834862386 = 2.411058514 Reorder the terms: -1.834862386 + t = 2.411058514 Solving -1.834862386 + t = 2.411058514 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.834862386' to each side of the equation. -1.834862386 + 1.834862386 + t = 2.411058514 + 1.834862386 Combine like terms: -1.834862386 + 1.834862386 = 0.000000000 0.000000000 + t = 2.411058514 + 1.834862386 t = 2.411058514 + 1.834862386 Combine like terms: 2.411058514 + 1.834862386 = 4.2459209 t = 4.2459209 Simplifying t = 4.2459209

Subproblem 2

t + -1.834862386 = -2.411058514 Simplifying t + -1.834862386 = -2.411058514 Reorder the terms: -1.834862386 + t = -2.411058514 Solving -1.834862386 + t = -2.411058514 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.834862386' to each side of the equation. -1.834862386 + 1.834862386 + t = -2.411058514 + 1.834862386 Combine like terms: -1.834862386 + 1.834862386 = 0.000000000 0.000000000 + t = -2.411058514 + 1.834862386 t = -2.411058514 + 1.834862386 Combine like terms: -2.411058514 + 1.834862386 = -0.576196128 t = -0.576196128 Simplifying t = -0.576196128

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.2459209, -0.576196128}

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