0=-t^2+2t+7

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Solution for 0=-t^2+2t+7 equation:


Simplifying
0 = -1t2 + 2t + 7

Reorder the terms:
0 = 7 + 2t + -1t2

Solving
0 = 7 + 2t + -1t2

Solving for variable 't'.

Combine like terms: 0 + -7 = -7
-7 + -2t + t2 = 7 + 2t + -1t2 + -7 + -2t + t2

Reorder the terms:
-7 + -2t + t2 = 7 + -7 + 2t + -2t + -1t2 + t2

Combine like terms: 7 + -7 = 0
-7 + -2t + t2 = 0 + 2t + -2t + -1t2 + t2
-7 + -2t + t2 = 2t + -2t + -1t2 + t2

Combine like terms: 2t + -2t = 0
-7 + -2t + t2 = 0 + -1t2 + t2
-7 + -2t + t2 = -1t2 + t2

Combine like terms: -1t2 + t2 = 0
-7 + -2t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -2t + 7 + t2 = 0 + 7

Reorder the terms:
-7 + 7 + -2t + t2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -2t + t2 = 0 + 7
-2t + t2 = 0 + 7

Combine like terms: 0 + 7 = 7
-2t + t2 = 7

The t term is -2t.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2t + 1 + t2 = 7 + 1

Reorder the terms:
1 + -2t + t2 = 7 + 1

Combine like terms: 7 + 1 = 8
1 + -2t + t2 = 8

Factor a perfect square on the left side:
(t + -1)(t + -1) = 8

Calculate the square root of the right side: 2.828427125

Break this problem into two subproblems by setting 
(t + -1) equal to 2.828427125 and -2.828427125.

Subproblem 1

t + -1 = 2.828427125 Simplifying t + -1 = 2.828427125 Reorder the terms: -1 + t = 2.828427125 Solving -1 + t = 2.828427125 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + t = 2.828427125 + 1 Combine like terms: -1 + 1 = 0 0 + t = 2.828427125 + 1 t = 2.828427125 + 1 Combine like terms: 2.828427125 + 1 = 3.828427125 t = 3.828427125 Simplifying t = 3.828427125

Subproblem 2

t + -1 = -2.828427125 Simplifying t + -1 = -2.828427125 Reorder the terms: -1 + t = -2.828427125 Solving -1 + t = -2.828427125 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + t = -2.828427125 + 1 Combine like terms: -1 + 1 = 0 0 + t = -2.828427125 + 1 t = -2.828427125 + 1 Combine like terms: -2.828427125 + 1 = -1.828427125 t = -1.828427125 Simplifying t = -1.828427125

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.828427125, -1.828427125}

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