1.6t^2=2.5t^2-20t+40

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Solution for 1.6t^2=2.5t^2-20t+40 equation:


Simplifying
1.6t2 = 2.5t2 + -20t + 40

Reorder the terms:
1.6t2 = 40 + -20t + 2.5t2

Solving
1.6t2 = 40 + -20t + 2.5t2

Solving for variable 't'.

Reorder the terms:
-40 + 20t + 1.6t2 + -2.5t2 = 40 + -20t + 2.5t2 + -40 + 20t + -2.5t2

Combine like terms: 1.6t2 + -2.5t2 = -0.9t2
-40 + 20t + -0.9t2 = 40 + -20t + 2.5t2 + -40 + 20t + -2.5t2

Reorder the terms:
-40 + 20t + -0.9t2 = 40 + -40 + -20t + 20t + 2.5t2 + -2.5t2

Combine like terms: 40 + -40 = 0
-40 + 20t + -0.9t2 = 0 + -20t + 20t + 2.5t2 + -2.5t2
-40 + 20t + -0.9t2 = -20t + 20t + 2.5t2 + -2.5t2

Combine like terms: -20t + 20t = 0
-40 + 20t + -0.9t2 = 0 + 2.5t2 + -2.5t2
-40 + 20t + -0.9t2 = 2.5t2 + -2.5t2

Combine like terms: 2.5t2 + -2.5t2 = 0.0
-40 + 20t + -0.9t2 = 0.0

Begin completing the square.  Divide all terms by
-0.9 the coefficient of the squared term: 

Divide each side by '-0.9'.
44.44444444 + -22.22222222t + t2 = 0

Move the constant term to the right:

Add '-44.44444444' to each side of the equation.
44.44444444 + -22.22222222t + -44.44444444 + t2 = 0 + -44.44444444

Reorder the terms:
44.44444444 + -44.44444444 + -22.22222222t + t2 = 0 + -44.44444444

Combine like terms: 44.44444444 + -44.44444444 = 0.00000000
0.00000000 + -22.22222222t + t2 = 0 + -44.44444444
-22.22222222t + t2 = 0 + -44.44444444

Combine like terms: 0 + -44.44444444 = -44.44444444
-22.22222222t + t2 = -44.44444444

The t term is -22.22222222t.  Take half its coefficient (-11.11111111).
Square it (123.4567901) and add it to both sides.

Add '123.4567901' to each side of the equation.
-22.22222222t + 123.4567901 + t2 = -44.44444444 + 123.4567901

Reorder the terms:
123.4567901 + -22.22222222t + t2 = -44.44444444 + 123.4567901

Combine like terms: -44.44444444 + 123.4567901 = 79.01234566
123.4567901 + -22.22222222t + t2 = 79.01234566

Factor a perfect square on the left side:
(t + -11.11111111)(t + -11.11111111) = 79.01234566

Calculate the square root of the right side: 8.888888888

Break this problem into two subproblems by setting 
(t + -11.11111111) equal to 8.888888888 and -8.888888888.

Subproblem 1

t + -11.11111111 = 8.888888888 Simplifying t + -11.11111111 = 8.888888888 Reorder the terms: -11.11111111 + t = 8.888888888 Solving -11.11111111 + t = 8.888888888 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '11.11111111' to each side of the equation. -11.11111111 + 11.11111111 + t = 8.888888888 + 11.11111111 Combine like terms: -11.11111111 + 11.11111111 = 0.00000000 0.00000000 + t = 8.888888888 + 11.11111111 t = 8.888888888 + 11.11111111 Combine like terms: 8.888888888 + 11.11111111 = 19.999999998 t = 19.999999998 Simplifying t = 19.999999998

Subproblem 2

t + -11.11111111 = -8.888888888 Simplifying t + -11.11111111 = -8.888888888 Reorder the terms: -11.11111111 + t = -8.888888888 Solving -11.11111111 + t = -8.888888888 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '11.11111111' to each side of the equation. -11.11111111 + 11.11111111 + t = -8.888888888 + 11.11111111 Combine like terms: -11.11111111 + 11.11111111 = 0.00000000 0.00000000 + t = -8.888888888 + 11.11111111 t = -8.888888888 + 11.11111111 Combine like terms: -8.888888888 + 11.11111111 = 2.222222222 t = 2.222222222 Simplifying t = 2.222222222

Solution

The solution to the problem is based on the solutions from the subproblems. t = {19.999999998, 2.222222222}

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