0.9=4t-t^2

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Solution for 0.9=4t-t^2 equation:


Simplifying
0.9 = 4t + -1t2

Solving
0.9 = 4t + -1t2

Solving for variable 't'.

Reorder the terms:
0.9 + -4t + t2 = 4t + -4t + -1t2 + t2

Combine like terms: 4t + -4t = 0
0.9 + -4t + t2 = 0 + -1t2 + t2
0.9 + -4t + t2 = -1t2 + t2

Combine like terms: -1t2 + t2 = 0
0.9 + -4t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-0.9' to each side of the equation.
0.9 + -4t + -0.9 + t2 = 0 + -0.9

Reorder the terms:
0.9 + -0.9 + -4t + t2 = 0 + -0.9

Combine like terms: 0.9 + -0.9 = 0.0
0.0 + -4t + t2 = 0 + -0.9
-4t + t2 = 0 + -0.9

Combine like terms: 0 + -0.9 = -0.9
-4t + t2 = -0.9

The t term is -4t.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4t + 4 + t2 = -0.9 + 4

Reorder the terms:
4 + -4t + t2 = -0.9 + 4

Combine like terms: -0.9 + 4 = 3.1
4 + -4t + t2 = 3.1

Factor a perfect square on the left side:
(t + -2)(t + -2) = 3.1

Calculate the square root of the right side: 1.760681686

Break this problem into two subproblems by setting 
(t + -2) equal to 1.760681686 and -1.760681686.

Subproblem 1

t + -2 = 1.760681686 Simplifying t + -2 = 1.760681686 Reorder the terms: -2 + t = 1.760681686 Solving -2 + t = 1.760681686 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + t = 1.760681686 + 2 Combine like terms: -2 + 2 = 0 0 + t = 1.760681686 + 2 t = 1.760681686 + 2 Combine like terms: 1.760681686 + 2 = 3.760681686 t = 3.760681686 Simplifying t = 3.760681686

Subproblem 2

t + -2 = -1.760681686 Simplifying t + -2 = -1.760681686 Reorder the terms: -2 + t = -1.760681686 Solving -2 + t = -1.760681686 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + t = -1.760681686 + 2 Combine like terms: -2 + 2 = 0 0 + t = -1.760681686 + 2 t = -1.760681686 + 2 Combine like terms: -1.760681686 + 2 = 0.239318314 t = 0.239318314 Simplifying t = 0.239318314

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.760681686, 0.239318314}

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