1.2t^2-15.6t+19.2=0

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Solution for 1.2t^2-15.6t+19.2=0 equation:


Simplifying
1.2t2 + -15.6t + 19.2 = 0

Reorder the terms:
19.2 + -15.6t + 1.2t2 = 0

Solving
19.2 + -15.6t + 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'.
16 + -13t + t2 = 0

Move the constant term to the right:

Add '-16' to each side of the equation.
16 + -13t + -16 + t2 = 0 + -16

Reorder the terms:
16 + -16 + -13t + t2 = 0 + -16

Combine like terms: 16 + -16 = 0
0 + -13t + t2 = 0 + -16
-13t + t2 = 0 + -16

Combine like terms: 0 + -16 = -16
-13t + t2 = -16

The t term is -13t.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13t + 42.25 + t2 = -16 + 42.25

Reorder the terms:
42.25 + -13t + t2 = -16 + 42.25

Combine like terms: -16 + 42.25 = 26.25
42.25 + -13t + t2 = 26.25

Factor a perfect square on the left side:
(t + -6.5)(t + -6.5) = 26.25

Calculate the square root of the right side: 5.123475383

Break this problem into two subproblems by setting 
(t + -6.5) equal to 5.123475383 and -5.123475383.

Subproblem 1

t + -6.5 = 5.123475383 Simplifying t + -6.5 = 5.123475383 Reorder the terms: -6.5 + t = 5.123475383 Solving -6.5 + t = 5.123475383 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + t = 5.123475383 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + t = 5.123475383 + 6.5 t = 5.123475383 + 6.5 Combine like terms: 5.123475383 + 6.5 = 11.623475383 t = 11.623475383 Simplifying t = 11.623475383

Subproblem 2

t + -6.5 = -5.123475383 Simplifying t + -6.5 = -5.123475383 Reorder the terms: -6.5 + t = -5.123475383 Solving -6.5 + t = -5.123475383 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + t = -5.123475383 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + t = -5.123475383 + 6.5 t = -5.123475383 + 6.5 Combine like terms: -5.123475383 + 6.5 = 1.376524617 t = 1.376524617 Simplifying t = 1.376524617

Solution

The solution to the problem is based on the solutions from the subproblems. t = {11.623475383, 1.376524617}

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