30=2t^2-6t+7

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Solution for 30=2t^2-6t+7 equation:


Simplifying
30 = 2t2 + -6t + 7

Reorder the terms:
30 = 7 + -6t + 2t2

Solving
30 = 7 + -6t + 2t2

Solving for variable 't'.

Combine like terms: 30 + -7 = 23
23 + 6t + -2t2 = 7 + -6t + 2t2 + -7 + 6t + -2t2

Reorder the terms:
23 + 6t + -2t2 = 7 + -7 + -6t + 6t + 2t2 + -2t2

Combine like terms: 7 + -7 = 0
23 + 6t + -2t2 = 0 + -6t + 6t + 2t2 + -2t2
23 + 6t + -2t2 = -6t + 6t + 2t2 + -2t2

Combine like terms: -6t + 6t = 0
23 + 6t + -2t2 = 0 + 2t2 + -2t2
23 + 6t + -2t2 = 2t2 + -2t2

Combine like terms: 2t2 + -2t2 = 0
23 + 6t + -2t2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-11.5 + -3t + t2 = 0

Move the constant term to the right:

Add '11.5' to each side of the equation.
-11.5 + -3t + 11.5 + t2 = 0 + 11.5

Reorder the terms:
-11.5 + 11.5 + -3t + t2 = 0 + 11.5

Combine like terms: -11.5 + 11.5 = 0.0
0.0 + -3t + t2 = 0 + 11.5
-3t + t2 = 0 + 11.5

Combine like terms: 0 + 11.5 = 11.5
-3t + t2 = 11.5

The t term is -3t.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3t + 2.25 + t2 = 11.5 + 2.25

Reorder the terms:
2.25 + -3t + t2 = 11.5 + 2.25

Combine like terms: 11.5 + 2.25 = 13.75
2.25 + -3t + t2 = 13.75

Factor a perfect square on the left side:
(t + -1.5)(t + -1.5) = 13.75

Calculate the square root of the right side: 3.708099244

Break this problem into two subproblems by setting 
(t + -1.5) equal to 3.708099244 and -3.708099244.

Subproblem 1

t + -1.5 = 3.708099244 Simplifying t + -1.5 = 3.708099244 Reorder the terms: -1.5 + t = 3.708099244 Solving -1.5 + t = 3.708099244 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + t = 3.708099244 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + t = 3.708099244 + 1.5 t = 3.708099244 + 1.5 Combine like terms: 3.708099244 + 1.5 = 5.208099244 t = 5.208099244 Simplifying t = 5.208099244

Subproblem 2

t + -1.5 = -3.708099244 Simplifying t + -1.5 = -3.708099244 Reorder the terms: -1.5 + t = -3.708099244 Solving -1.5 + t = -3.708099244 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + t = -3.708099244 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + t = -3.708099244 + 1.5 t = -3.708099244 + 1.5 Combine like terms: -3.708099244 + 1.5 = -2.208099244 t = -2.208099244 Simplifying t = -2.208099244

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.208099244, -2.208099244}

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