0=-7t^2+12t+25

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Solution for 0=-7t^2+12t+25 equation:


Simplifying
0 = -7t2 + 12t + 25

Reorder the terms:
0 = 25 + 12t + -7t2

Solving
0 = 25 + 12t + -7t2

Solving for variable 't'.

Combine like terms: 0 + -25 = -25
-25 + -12t + 7t2 = 25 + 12t + -7t2 + -25 + -12t + 7t2

Reorder the terms:
-25 + -12t + 7t2 = 25 + -25 + 12t + -12t + -7t2 + 7t2

Combine like terms: 25 + -25 = 0
-25 + -12t + 7t2 = 0 + 12t + -12t + -7t2 + 7t2
-25 + -12t + 7t2 = 12t + -12t + -7t2 + 7t2

Combine like terms: 12t + -12t = 0
-25 + -12t + 7t2 = 0 + -7t2 + 7t2
-25 + -12t + 7t2 = -7t2 + 7t2

Combine like terms: -7t2 + 7t2 = 0
-25 + -12t + 7t2 = 0

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

Divide each side by '7'.
-3.571428571 + -1.714285714t + t2 = 0

Move the constant term to the right:

Add '3.571428571' to each side of the equation.
-3.571428571 + -1.714285714t + 3.571428571 + t2 = 0 + 3.571428571

Reorder the terms:
-3.571428571 + 3.571428571 + -1.714285714t + t2 = 0 + 3.571428571

Combine like terms: -3.571428571 + 3.571428571 = 0.000000000
0.000000000 + -1.714285714t + t2 = 0 + 3.571428571
-1.714285714t + t2 = 0 + 3.571428571

Combine like terms: 0 + 3.571428571 = 3.571428571
-1.714285714t + t2 = 3.571428571

The t term is -1.714285714t.  Take half its coefficient (-0.857142857).
Square it (0.7346938773) and add it to both sides.

Add '0.7346938773' to each side of the equation.
-1.714285714t + 0.7346938773 + t2 = 3.571428571 + 0.7346938773

Reorder the terms:
0.7346938773 + -1.714285714t + t2 = 3.571428571 + 0.7346938773

Combine like terms: 3.571428571 + 0.7346938773 = 4.3061224483
0.7346938773 + -1.714285714t + t2 = 4.3061224483

Factor a perfect square on the left side:
(t + -0.857142857)(t + -0.857142857) = 4.3061224483

Calculate the square root of the right side: 2.075119864

Break this problem into two subproblems by setting 
(t + -0.857142857) equal to 2.075119864 and -2.075119864.

Subproblem 1

t + -0.857142857 = 2.075119864 Simplifying t + -0.857142857 = 2.075119864 Reorder the terms: -0.857142857 + t = 2.075119864 Solving -0.857142857 + t = 2.075119864 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.857142857' to each side of the equation. -0.857142857 + 0.857142857 + t = 2.075119864 + 0.857142857 Combine like terms: -0.857142857 + 0.857142857 = 0.000000000 0.000000000 + t = 2.075119864 + 0.857142857 t = 2.075119864 + 0.857142857 Combine like terms: 2.075119864 + 0.857142857 = 2.932262721 t = 2.932262721 Simplifying t = 2.932262721

Subproblem 2

t + -0.857142857 = -2.075119864 Simplifying t + -0.857142857 = -2.075119864 Reorder the terms: -0.857142857 + t = -2.075119864 Solving -0.857142857 + t = -2.075119864 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.857142857' to each side of the equation. -0.857142857 + 0.857142857 + t = -2.075119864 + 0.857142857 Combine like terms: -0.857142857 + 0.857142857 = 0.000000000 0.000000000 + t = -2.075119864 + 0.857142857 t = -2.075119864 + 0.857142857 Combine like terms: -2.075119864 + 0.857142857 = -1.217977007 t = -1.217977007 Simplifying t = -1.217977007

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.932262721, -1.217977007}

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