2t^2-9t+16=15-4t^2

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Solution for 2t^2-9t+16=15-4t^2 equation:


Simplifying
2t2 + -9t + 16 = 15 + -4t2

Reorder the terms:
16 + -9t + 2t2 = 15 + -4t2

Solving
16 + -9t + 2t2 = 15 + -4t2

Solving for variable 't'.

Reorder the terms:
16 + -15 + -9t + 2t2 + 4t2 = 15 + -4t2 + -15 + 4t2

Combine like terms: 16 + -15 = 1
1 + -9t + 2t2 + 4t2 = 15 + -4t2 + -15 + 4t2

Combine like terms: 2t2 + 4t2 = 6t2
1 + -9t + 6t2 = 15 + -4t2 + -15 + 4t2

Reorder the terms:
1 + -9t + 6t2 = 15 + -15 + -4t2 + 4t2

Combine like terms: 15 + -15 = 0
1 + -9t + 6t2 = 0 + -4t2 + 4t2
1 + -9t + 6t2 = -4t2 + 4t2

Combine like terms: -4t2 + 4t2 = 0
1 + -9t + 6t2 = 0

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

Divide each side by '6'.
0.1666666667 + -1.5t + t2 = 0

Move the constant term to the right:

Add '-0.1666666667' to each side of the equation.
0.1666666667 + -1.5t + -0.1666666667 + t2 = 0 + -0.1666666667

Reorder the terms:
0.1666666667 + -0.1666666667 + -1.5t + t2 = 0 + -0.1666666667

Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000
0.0000000000 + -1.5t + t2 = 0 + -0.1666666667
-1.5t + t2 = 0 + -0.1666666667

Combine like terms: 0 + -0.1666666667 = -0.1666666667
-1.5t + t2 = -0.1666666667

The t term is -1.5t.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5t + 0.5625 + t2 = -0.1666666667 + 0.5625

Reorder the terms:
0.5625 + -1.5t + t2 = -0.1666666667 + 0.5625

Combine like terms: -0.1666666667 + 0.5625 = 0.3958333333
0.5625 + -1.5t + t2 = 0.3958333333

Factor a perfect square on the left side:
(t + -0.75)(t + -0.75) = 0.3958333333

Calculate the square root of the right side: 0.62915287

Break this problem into two subproblems by setting 
(t + -0.75) equal to 0.62915287 and -0.62915287.

Subproblem 1

t + -0.75 = 0.62915287 Simplifying t + -0.75 = 0.62915287 Reorder the terms: -0.75 + t = 0.62915287 Solving -0.75 + t = 0.62915287 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + t = 0.62915287 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + t = 0.62915287 + 0.75 t = 0.62915287 + 0.75 Combine like terms: 0.62915287 + 0.75 = 1.37915287 t = 1.37915287 Simplifying t = 1.37915287

Subproblem 2

t + -0.75 = -0.62915287 Simplifying t + -0.75 = -0.62915287 Reorder the terms: -0.75 + t = -0.62915287 Solving -0.75 + t = -0.62915287 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + t = -0.62915287 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + t = -0.62915287 + 0.75 t = -0.62915287 + 0.75 Combine like terms: -0.62915287 + 0.75 = 0.12084713 t = 0.12084713 Simplifying t = 0.12084713

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.37915287, 0.12084713}

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