20=25t-4.9t^2

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Solution for 20=25t-4.9t^2 equation:


Simplifying
20 = 25t + -4.9t2

Solving
20 = 25t + -4.9t2

Solving for variable 't'.

Reorder the terms:
20 + -25t + 4.9t2 = 25t + -25t + -4.9t2 + 4.9t2

Combine like terms: 25t + -25t = 0
20 + -25t + 4.9t2 = 0 + -4.9t2 + 4.9t2
20 + -25t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
20 + -25t + 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 + -5.102040816t + t2 = 0

Move the constant term to the right:

Add '-4.081632653' to each side of the equation.
4.081632653 + -5.102040816t + -4.081632653 + t2 = 0 + -4.081632653

Reorder the terms:
4.081632653 + -4.081632653 + -5.102040816t + t2 = 0 + -4.081632653

Combine like terms: 4.081632653 + -4.081632653 = 0.000000000
0.000000000 + -5.102040816t + t2 = 0 + -4.081632653
-5.102040816t + t2 = 0 + -4.081632653

Combine like terms: 0 + -4.081632653 = -4.081632653
-5.102040816t + t2 = -4.081632653

The t term is -5.102040816t.  Take half its coefficient (-2.551020408).
Square it (6.507705122) and add it to both sides.

Add '6.507705122' to each side of the equation.
-5.102040816t + 6.507705122 + t2 = -4.081632653 + 6.507705122

Reorder the terms:
6.507705122 + -5.102040816t + t2 = -4.081632653 + 6.507705122

Combine like terms: -4.081632653 + 6.507705122 = 2.426072469
6.507705122 + -5.102040816t + t2 = 2.426072469

Factor a perfect square on the left side:
(t + -2.551020408)(t + -2.551020408) = 2.426072469

Calculate the square root of the right side: 1.557585461

Break this problem into two subproblems by setting 
(t + -2.551020408) equal to 1.557585461 and -1.557585461.

Subproblem 1

t + -2.551020408 = 1.557585461 Simplifying t + -2.551020408 = 1.557585461 Reorder the terms: -2.551020408 + t = 1.557585461 Solving -2.551020408 + t = 1.557585461 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.551020408' to each side of the equation. -2.551020408 + 2.551020408 + t = 1.557585461 + 2.551020408 Combine like terms: -2.551020408 + 2.551020408 = 0.000000000 0.000000000 + t = 1.557585461 + 2.551020408 t = 1.557585461 + 2.551020408 Combine like terms: 1.557585461 + 2.551020408 = 4.108605869 t = 4.108605869 Simplifying t = 4.108605869

Subproblem 2

t + -2.551020408 = -1.557585461 Simplifying t + -2.551020408 = -1.557585461 Reorder the terms: -2.551020408 + t = -1.557585461 Solving -2.551020408 + t = -1.557585461 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.551020408' to each side of the equation. -2.551020408 + 2.551020408 + t = -1.557585461 + 2.551020408 Combine like terms: -2.551020408 + 2.551020408 = 0.000000000 0.000000000 + t = -1.557585461 + 2.551020408 t = -1.557585461 + 2.551020408 Combine like terms: -1.557585461 + 2.551020408 = 0.993434947 t = 0.993434947 Simplifying t = 0.993434947

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.108605869, 0.993434947}

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