3t+8t=t^2-3t-12

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Solution for 3t+8t=t^2-3t-12 equation:


Simplifying
3t + 8t = t2 + -3t + -12

Combine like terms: 3t + 8t = 11t
11t = t2 + -3t + -12

Reorder the terms:
11t = -12 + -3t + t2

Solving
11t = -12 + -3t + t2

Solving for variable 't'.

Reorder the terms:
12 + 11t + 3t + -1t2 = -12 + -3t + t2 + 12 + 3t + -1t2

Combine like terms: 11t + 3t = 14t
12 + 14t + -1t2 = -12 + -3t + t2 + 12 + 3t + -1t2

Reorder the terms:
12 + 14t + -1t2 = -12 + 12 + -3t + 3t + t2 + -1t2

Combine like terms: -12 + 12 = 0
12 + 14t + -1t2 = 0 + -3t + 3t + t2 + -1t2
12 + 14t + -1t2 = -3t + 3t + t2 + -1t2

Combine like terms: -3t + 3t = 0
12 + 14t + -1t2 = 0 + t2 + -1t2
12 + 14t + -1t2 = t2 + -1t2

Combine like terms: t2 + -1t2 = 0
12 + 14t + -1t2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-12 + -14t + t2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -14t + 12 + t2 = 0 + 12

Reorder the terms:
-12 + 12 + -14t + t2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -14t + t2 = 0 + 12
-14t + t2 = 0 + 12

Combine like terms: 0 + 12 = 12
-14t + t2 = 12

The t term is -14t.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14t + 49 + t2 = 12 + 49

Reorder the terms:
49 + -14t + t2 = 12 + 49

Combine like terms: 12 + 49 = 61
49 + -14t + t2 = 61

Factor a perfect square on the left side:
(t + -7)(t + -7) = 61

Calculate the square root of the right side: 7.810249676

Break this problem into two subproblems by setting 
(t + -7) equal to 7.810249676 and -7.810249676.

Subproblem 1

t + -7 = 7.810249676 Simplifying t + -7 = 7.810249676 Reorder the terms: -7 + t = 7.810249676 Solving -7 + t = 7.810249676 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + t = 7.810249676 + 7 Combine like terms: -7 + 7 = 0 0 + t = 7.810249676 + 7 t = 7.810249676 + 7 Combine like terms: 7.810249676 + 7 = 14.810249676 t = 14.810249676 Simplifying t = 14.810249676

Subproblem 2

t + -7 = -7.810249676 Simplifying t + -7 = -7.810249676 Reorder the terms: -7 + t = -7.810249676 Solving -7 + t = -7.810249676 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + t = -7.810249676 + 7 Combine like terms: -7 + 7 = 0 0 + t = -7.810249676 + 7 t = -7.810249676 + 7 Combine like terms: -7.810249676 + 7 = -0.810249676 t = -0.810249676 Simplifying t = -0.810249676

Solution

The solution to the problem is based on the solutions from the subproblems. t = {14.810249676, -0.810249676}

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