-t^2+4t+5=4

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Solution for -t^2+4t+5=4 equation:


Simplifying
-1t2 + 4t + 5 = 4

Reorder the terms:
5 + 4t + -1t2 = 4

Solving
5 + 4t + -1t2 = 4

Solving for variable 't'.

Reorder the terms:
5 + -4 + 4t + -1t2 = 4 + -4

Combine like terms: 5 + -4 = 1
1 + 4t + -1t2 = 4 + -4

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

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-1 + -4t + t2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -4t + 1 + t2 = 0 + 1

Reorder the terms:
-1 + 1 + -4t + t2 = 0 + 1

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

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

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 = 1 + 4

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

Combine like terms: 1 + 4 = 5
4 + -4t + t2 = 5

Factor a perfect square on the left side:
(t + -2)(t + -2) = 5

Calculate the square root of the right side: 2.236067978

Break this problem into two subproblems by setting 
(t + -2) equal to 2.236067978 and -2.236067978.

Subproblem 1

t + -2 = 2.236067978 Simplifying t + -2 = 2.236067978 Reorder the terms: -2 + t = 2.236067978 Solving -2 + t = 2.236067978 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 = 2.236067978 + 2 Combine like terms: -2 + 2 = 0 0 + t = 2.236067978 + 2 t = 2.236067978 + 2 Combine like terms: 2.236067978 + 2 = 4.236067978 t = 4.236067978 Simplifying t = 4.236067978

Subproblem 2

t + -2 = -2.236067978 Simplifying t + -2 = -2.236067978 Reorder the terms: -2 + t = -2.236067978 Solving -2 + t = -2.236067978 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 = -2.236067978 + 2 Combine like terms: -2 + 2 = 0 0 + t = -2.236067978 + 2 t = -2.236067978 + 2 Combine like terms: -2.236067978 + 2 = -0.236067978 t = -0.236067978 Simplifying t = -0.236067978

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.236067978, -0.236067978}

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