13t^2+78t=65

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Solution for 13t^2+78t=65 equation:


Simplifying
13t2 + 78t = 65

Reorder the terms:
78t + 13t2 = 65

Solving
78t + 13t2 = 65

Solving for variable 't'.

Reorder the terms:
-65 + 78t + 13t2 = 65 + -65

Combine like terms: 65 + -65 = 0
-65 + 78t + 13t2 = 0

Factor out the Greatest Common Factor (GCF), '13'.
13(-5 + 6t + t2) = 0

Ignore the factor 13.

Subproblem 1

Set the factor '(-5 + 6t + t2)' equal to zero and attempt to solve: Simplifying -5 + 6t + t2 = 0 Solving -5 + 6t + t2 = 0 Begin completing the square. Move the constant term to the right: Add '5' to each side of the equation. -5 + 6t + 5 + t2 = 0 + 5 Reorder the terms: -5 + 5 + 6t + t2 = 0 + 5 Combine like terms: -5 + 5 = 0 0 + 6t + t2 = 0 + 5 6t + t2 = 0 + 5 Combine like terms: 0 + 5 = 5 6t + t2 = 5 The t term is 6t. Take half its coefficient (3). Square it (9) and add it to both sides. Add '9' to each side of the equation. 6t + 9 + t2 = 5 + 9 Reorder the terms: 9 + 6t + t2 = 5 + 9 Combine like terms: 5 + 9 = 14 9 + 6t + t2 = 14 Factor a perfect square on the left side: (t + 3)(t + 3) = 14 Calculate the square root of the right side: 3.741657387 Break this problem into two subproblems by setting (t + 3) equal to 3.741657387 and -3.741657387.

Subproblem 1

t + 3 = 3.741657387 Simplifying t + 3 = 3.741657387 Reorder the terms: 3 + t = 3.741657387 Solving 3 + t = 3.741657387 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + t = 3.741657387 + -3 Combine like terms: 3 + -3 = 0 0 + t = 3.741657387 + -3 t = 3.741657387 + -3 Combine like terms: 3.741657387 + -3 = 0.741657387 t = 0.741657387 Simplifying t = 0.741657387

Subproblem 2

t + 3 = -3.741657387 Simplifying t + 3 = -3.741657387 Reorder the terms: 3 + t = -3.741657387 Solving 3 + t = -3.741657387 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + t = -3.741657387 + -3 Combine like terms: 3 + -3 = 0 0 + t = -3.741657387 + -3 t = -3.741657387 + -3 Combine like terms: -3.741657387 + -3 = -6.741657387 t = -6.741657387 Simplifying t = -6.741657387

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.741657387, -6.741657387}

Solution

t = {0.741657387, -6.741657387}

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