-7t^2-7t+9=0

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Solution for -7t^2-7t+9=0 equation:


Simplifying
-7t2 + -7t + 9 = 0

Reorder the terms:
9 + -7t + -7t2 = 0

Solving
9 + -7t + -7t2 = 0

Solving for variable 't'.

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

Divide each side by '-7'.
-1.285714286 + t + t2 = 0

Move the constant term to the right:

Add '1.285714286' to each side of the equation.
-1.285714286 + t + 1.285714286 + t2 = 0 + 1.285714286

Reorder the terms:
-1.285714286 + 1.285714286 + t + t2 = 0 + 1.285714286

Combine like terms: -1.285714286 + 1.285714286 = 0.000000000
0.000000000 + t + t2 = 0 + 1.285714286
t + t2 = 0 + 1.285714286

Combine like terms: 0 + 1.285714286 = 1.285714286
t + t2 = 1.285714286

The t term is t.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + t2 = 1.285714286 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + t2 = 1.285714286 + 0.25

Combine like terms: 1.285714286 + 0.25 = 1.535714286
1.25 + t2 = 1.535714286

Factor a perfect square on the left side:
(t + 0.5)(t + 0.5) = 1.535714286

Calculate the square root of the right side: 1.239239398

Break this problem into two subproblems by setting 
(t + 0.5) equal to 1.239239398 and -1.239239398.

Subproblem 1

t + 0.5 = 1.239239398 Simplifying t + 0.5 = 1.239239398 Reorder the terms: 0.5 + t = 1.239239398 Solving 0.5 + t = 1.239239398 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + t = 1.239239398 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + t = 1.239239398 + -0.5 t = 1.239239398 + -0.5 Combine like terms: 1.239239398 + -0.5 = 0.739239398 t = 0.739239398 Simplifying t = 0.739239398

Subproblem 2

t + 0.5 = -1.239239398 Simplifying t + 0.5 = -1.239239398 Reorder the terms: 0.5 + t = -1.239239398 Solving 0.5 + t = -1.239239398 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + t = -1.239239398 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + t = -1.239239398 + -0.5 t = -1.239239398 + -0.5 Combine like terms: -1.239239398 + -0.5 = -1.739239398 t = -1.739239398 Simplifying t = -1.739239398

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.739239398, -1.739239398}

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