1.2t^2-3.5t-7=0

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Solution for 1.2t^2-3.5t-7=0 equation:


Simplifying
1.2t2 + -3.5t + -7 = 0

Reorder the terms:
-7 + -3.5t + 1.2t2 = 0

Solving
-7 + -3.5t + 1.2t2 = 0

Solving for variable 't'.

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

Divide each side by '1.2'.
-5.833333333 + -2.916666667t + t2 = 0

Move the constant term to the right:

Add '5.833333333' to each side of the equation.
-5.833333333 + -2.916666667t + 5.833333333 + t2 = 0 + 5.833333333

Reorder the terms:
-5.833333333 + 5.833333333 + -2.916666667t + t2 = 0 + 5.833333333

Combine like terms: -5.833333333 + 5.833333333 = 0.000000000
0.000000000 + -2.916666667t + t2 = 0 + 5.833333333
-2.916666667t + t2 = 0 + 5.833333333

Combine like terms: 0 + 5.833333333 = 5.833333333
-2.916666667t + t2 = 5.833333333

The t term is -2.916666667t.  Take half its coefficient (-1.458333334).
Square it (2.126736113) and add it to both sides.

Add '2.126736113' to each side of the equation.
-2.916666667t + 2.126736113 + t2 = 5.833333333 + 2.126736113

Reorder the terms:
2.126736113 + -2.916666667t + t2 = 5.833333333 + 2.126736113

Combine like terms: 5.833333333 + 2.126736113 = 7.960069446
2.126736113 + -2.916666667t + t2 = 7.960069446

Factor a perfect square on the left side:
(t + -1.458333334)(t + -1.458333334) = 7.960069446

Calculate the square root of the right side: 2.821359503

Break this problem into two subproblems by setting 
(t + -1.458333334) equal to 2.821359503 and -2.821359503.

Subproblem 1

t + -1.458333334 = 2.821359503 Simplifying t + -1.458333334 = 2.821359503 Reorder the terms: -1.458333334 + t = 2.821359503 Solving -1.458333334 + t = 2.821359503 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.458333334' to each side of the equation. -1.458333334 + 1.458333334 + t = 2.821359503 + 1.458333334 Combine like terms: -1.458333334 + 1.458333334 = 0.000000000 0.000000000 + t = 2.821359503 + 1.458333334 t = 2.821359503 + 1.458333334 Combine like terms: 2.821359503 + 1.458333334 = 4.279692837 t = 4.279692837 Simplifying t = 4.279692837

Subproblem 2

t + -1.458333334 = -2.821359503 Simplifying t + -1.458333334 = -2.821359503 Reorder the terms: -1.458333334 + t = -2.821359503 Solving -1.458333334 + t = -2.821359503 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.458333334' to each side of the equation. -1.458333334 + 1.458333334 + t = -2.821359503 + 1.458333334 Combine like terms: -1.458333334 + 1.458333334 = 0.000000000 0.000000000 + t = -2.821359503 + 1.458333334 t = -2.821359503 + 1.458333334 Combine like terms: -2.821359503 + 1.458333334 = -1.363026169 t = -1.363026169 Simplifying t = -1.363026169

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.279692837, -1.363026169}

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