2t^2+15=6t^2-5t

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Solution for 2t^2+15=6t^2-5t equation:


Simplifying
2t2 + 15 = 6t2 + -5t

Reorder the terms:
15 + 2t2 = 6t2 + -5t

Reorder the terms:
15 + 2t2 = -5t + 6t2

Solving
15 + 2t2 = -5t + 6t2

Solving for variable 't'.

Reorder the terms:
15 + 5t + 2t2 + -6t2 = -5t + 6t2 + 5t + -6t2

Combine like terms: 2t2 + -6t2 = -4t2
15 + 5t + -4t2 = -5t + 6t2 + 5t + -6t2

Reorder the terms:
15 + 5t + -4t2 = -5t + 5t + 6t2 + -6t2

Combine like terms: -5t + 5t = 0
15 + 5t + -4t2 = 0 + 6t2 + -6t2
15 + 5t + -4t2 = 6t2 + -6t2

Combine like terms: 6t2 + -6t2 = 0
15 + 5t + -4t2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-3.75 + -1.25t + t2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + -1.25t + 3.75 + t2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + -1.25t + t2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + -1.25t + t2 = 0 + 3.75
-1.25t + t2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
-1.25t + t2 = 3.75

The t term is -1.25t.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25t + 0.390625 + t2 = 3.75 + 0.390625

Reorder the terms:
0.390625 + -1.25t + t2 = 3.75 + 0.390625

Combine like terms: 3.75 + 0.390625 = 4.140625
0.390625 + -1.25t + t2 = 4.140625

Factor a perfect square on the left side:
(t + -0.625)(t + -0.625) = 4.140625

Calculate the square root of the right side: 2.034852575

Break this problem into two subproblems by setting 
(t + -0.625) equal to 2.034852575 and -2.034852575.

Subproblem 1

t + -0.625 = 2.034852575 Simplifying t + -0.625 = 2.034852575 Reorder the terms: -0.625 + t = 2.034852575 Solving -0.625 + t = 2.034852575 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = 2.034852575 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = 2.034852575 + 0.625 t = 2.034852575 + 0.625 Combine like terms: 2.034852575 + 0.625 = 2.659852575 t = 2.659852575 Simplifying t = 2.659852575

Subproblem 2

t + -0.625 = -2.034852575 Simplifying t + -0.625 = -2.034852575 Reorder the terms: -0.625 + t = -2.034852575 Solving -0.625 + t = -2.034852575 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = -2.034852575 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = -2.034852575 + 0.625 t = -2.034852575 + 0.625 Combine like terms: -2.034852575 + 0.625 = -1.409852575 t = -1.409852575 Simplifying t = -1.409852575

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.659852575, -1.409852575}

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