-4.9t^2+20.38t+1.2=0

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Solution for -4.9t^2+20.38t+1.2=0 equation:


Simplifying
-4.9t2 + 20.38t + 1.2 = 0

Reorder the terms:
1.2 + 20.38t + -4.9t2 = 0

Solving
1.2 + 20.38t + -4.9t2 = 0

Solving for variable 't'.

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

Divide each side by '-4.9'.
-0.2448979592 + -4.159183673t + t2 = 0

Move the constant term to the right:

Add '0.2448979592' to each side of the equation.
-0.2448979592 + -4.159183673t + 0.2448979592 + t2 = 0 + 0.2448979592

Reorder the terms:
-0.2448979592 + 0.2448979592 + -4.159183673t + t2 = 0 + 0.2448979592

Combine like terms: -0.2448979592 + 0.2448979592 = 0.0000000000
0.0000000000 + -4.159183673t + t2 = 0 + 0.2448979592
-4.159183673t + t2 = 0 + 0.2448979592

Combine like terms: 0 + 0.2448979592 = 0.2448979592
-4.159183673t + t2 = 0.2448979592

The t term is -4.159183673t.  Take half its coefficient (-2.079591837).
Square it (4.324702209) and add it to both sides.

Add '4.324702209' to each side of the equation.
-4.159183673t + 4.324702209 + t2 = 0.2448979592 + 4.324702209

Reorder the terms:
4.324702209 + -4.159183673t + t2 = 0.2448979592 + 4.324702209

Combine like terms: 0.2448979592 + 4.324702209 = 4.5696001682
4.324702209 + -4.159183673t + t2 = 4.5696001682

Factor a perfect square on the left side:
(t + -2.079591837)(t + -2.079591837) = 4.5696001682

Calculate the square root of the right side: 2.137662314

Break this problem into two subproblems by setting 
(t + -2.079591837) equal to 2.137662314 and -2.137662314.

Subproblem 1

t + -2.079591837 = 2.137662314 Simplifying t + -2.079591837 = 2.137662314 Reorder the terms: -2.079591837 + t = 2.137662314 Solving -2.079591837 + t = 2.137662314 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.079591837' to each side of the equation. -2.079591837 + 2.079591837 + t = 2.137662314 + 2.079591837 Combine like terms: -2.079591837 + 2.079591837 = 0.000000000 0.000000000 + t = 2.137662314 + 2.079591837 t = 2.137662314 + 2.079591837 Combine like terms: 2.137662314 + 2.079591837 = 4.217254151 t = 4.217254151 Simplifying t = 4.217254151

Subproblem 2

t + -2.079591837 = -2.137662314 Simplifying t + -2.079591837 = -2.137662314 Reorder the terms: -2.079591837 + t = -2.137662314 Solving -2.079591837 + t = -2.137662314 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.079591837' to each side of the equation. -2.079591837 + 2.079591837 + t = -2.137662314 + 2.079591837 Combine like terms: -2.079591837 + 2.079591837 = 0.000000000 0.000000000 + t = -2.137662314 + 2.079591837 t = -2.137662314 + 2.079591837 Combine like terms: -2.137662314 + 2.079591837 = -0.058070477 t = -0.058070477 Simplifying t = -0.058070477

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.217254151, -0.058070477}

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