-3t^2+18t+20=2t+5

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Solution for -3t^2+18t+20=2t+5 equation:


Simplifying
-3t2 + 18t + 20 = 2t + 5

Reorder the terms:
20 + 18t + -3t2 = 2t + 5

Reorder the terms:
20 + 18t + -3t2 = 5 + 2t

Solving
20 + 18t + -3t2 = 5 + 2t

Solving for variable 't'.

Reorder the terms:
20 + -5 + 18t + -2t + -3t2 = 5 + 2t + -5 + -2t

Combine like terms: 20 + -5 = 15
15 + 18t + -2t + -3t2 = 5 + 2t + -5 + -2t

Combine like terms: 18t + -2t = 16t
15 + 16t + -3t2 = 5 + 2t + -5 + -2t

Reorder the terms:
15 + 16t + -3t2 = 5 + -5 + 2t + -2t

Combine like terms: 5 + -5 = 0
15 + 16t + -3t2 = 0 + 2t + -2t
15 + 16t + -3t2 = 2t + -2t

Combine like terms: 2t + -2t = 0
15 + 16t + -3t2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-5 + -5.333333333t + t2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -5.333333333t + 5 + t2 = 0 + 5

Reorder the terms:
-5 + 5 + -5.333333333t + t2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -5.333333333t + t2 = 0 + 5
-5.333333333t + t2 = 0 + 5

Combine like terms: 0 + 5 = 5
-5.333333333t + t2 = 5

The t term is -5.333333333t.  Take half its coefficient (-2.666666667).
Square it (7.111111113) and add it to both sides.

Add '7.111111113' to each side of the equation.
-5.333333333t + 7.111111113 + t2 = 5 + 7.111111113

Reorder the terms:
7.111111113 + -5.333333333t + t2 = 5 + 7.111111113

Combine like terms: 5 + 7.111111113 = 12.111111113
7.111111113 + -5.333333333t + t2 = 12.111111113

Factor a perfect square on the left side:
(t + -2.666666667)(t + -2.666666667) = 12.111111113

Calculate the square root of the right side: 3.48010217

Break this problem into two subproblems by setting 
(t + -2.666666667) equal to 3.48010217 and -3.48010217.

Subproblem 1

t + -2.666666667 = 3.48010217 Simplifying t + -2.666666667 = 3.48010217 Reorder the terms: -2.666666667 + t = 3.48010217 Solving -2.666666667 + t = 3.48010217 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.666666667' to each side of the equation. -2.666666667 + 2.666666667 + t = 3.48010217 + 2.666666667 Combine like terms: -2.666666667 + 2.666666667 = 0.000000000 0.000000000 + t = 3.48010217 + 2.666666667 t = 3.48010217 + 2.666666667 Combine like terms: 3.48010217 + 2.666666667 = 6.146768837 t = 6.146768837 Simplifying t = 6.146768837

Subproblem 2

t + -2.666666667 = -3.48010217 Simplifying t + -2.666666667 = -3.48010217 Reorder the terms: -2.666666667 + t = -3.48010217 Solving -2.666666667 + t = -3.48010217 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.666666667' to each side of the equation. -2.666666667 + 2.666666667 + t = -3.48010217 + 2.666666667 Combine like terms: -2.666666667 + 2.666666667 = 0.000000000 0.000000000 + t = -3.48010217 + 2.666666667 t = -3.48010217 + 2.666666667 Combine like terms: -3.48010217 + 2.666666667 = -0.813435503 t = -0.813435503 Simplifying t = -0.813435503

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.146768837, -0.813435503}

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