20=13.3t+4.9t^2

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Solution for 20=13.3t+4.9t^2 equation:


Simplifying
20 = 13.3t + 4.9t2

Solving
20 = 13.3t + 4.9t2

Solving for variable 't'.

Reorder the terms:
20 + -13.3t + -4.9t2 = 13.3t + -13.3t + 4.9t2 + -4.9t2

Combine like terms: 13.3t + -13.3t = 0.0
20 + -13.3t + -4.9t2 = 0.0 + 4.9t2 + -4.9t2
20 + -13.3t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
20 + -13.3t + -4.9t2 = 0.0

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

Divide each side by '-4.9'.
-4.081632653 + 2.714285714t + t2 = 0

Move the constant term to the right:

Add '4.081632653' to each side of the equation.
-4.081632653 + 2.714285714t + 4.081632653 + t2 = 0 + 4.081632653

Reorder the terms:
-4.081632653 + 4.081632653 + 2.714285714t + t2 = 0 + 4.081632653

Combine like terms: -4.081632653 + 4.081632653 = 0.000000000
0.000000000 + 2.714285714t + t2 = 0 + 4.081632653
2.714285714t + t2 = 0 + 4.081632653

Combine like terms: 0 + 4.081632653 = 4.081632653
2.714285714t + t2 = 4.081632653

The t term is 2.714285714t.  Take half its coefficient (1.357142857).
Square it (1.841836734) and add it to both sides.

Add '1.841836734' to each side of the equation.
2.714285714t + 1.841836734 + t2 = 4.081632653 + 1.841836734

Reorder the terms:
1.841836734 + 2.714285714t + t2 = 4.081632653 + 1.841836734

Combine like terms: 4.081632653 + 1.841836734 = 5.923469387
1.841836734 + 2.714285714t + t2 = 5.923469387

Factor a perfect square on the left side:
(t + 1.357142857)(t + 1.357142857) = 5.923469387

Calculate the square root of the right side: 2.433817862

Break this problem into two subproblems by setting 
(t + 1.357142857) equal to 2.433817862 and -2.433817862.

Subproblem 1

t + 1.357142857 = 2.433817862 Simplifying t + 1.357142857 = 2.433817862 Reorder the terms: 1.357142857 + t = 2.433817862 Solving 1.357142857 + t = 2.433817862 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.357142857' to each side of the equation. 1.357142857 + -1.357142857 + t = 2.433817862 + -1.357142857 Combine like terms: 1.357142857 + -1.357142857 = 0.000000000 0.000000000 + t = 2.433817862 + -1.357142857 t = 2.433817862 + -1.357142857 Combine like terms: 2.433817862 + -1.357142857 = 1.076675005 t = 1.076675005 Simplifying t = 1.076675005

Subproblem 2

t + 1.357142857 = -2.433817862 Simplifying t + 1.357142857 = -2.433817862 Reorder the terms: 1.357142857 + t = -2.433817862 Solving 1.357142857 + t = -2.433817862 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.357142857' to each side of the equation. 1.357142857 + -1.357142857 + t = -2.433817862 + -1.357142857 Combine like terms: 1.357142857 + -1.357142857 = 0.000000000 0.000000000 + t = -2.433817862 + -1.357142857 t = -2.433817862 + -1.357142857 Combine like terms: -2.433817862 + -1.357142857 = -3.790960719 t = -3.790960719 Simplifying t = -3.790960719

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.076675005, -3.790960719}

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