-t(5t-7)=-5

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Solution for -t(5t-7)=-5 equation:


Simplifying
-1t(5t + -7) = -5

Reorder the terms:
-1t(-7 + 5t) = -5
(-7 * -1t + 5t * -1t) = -5
(7t + -5t2) = -5

Solving
7t + -5t2 = -5

Solving for variable 't'.

Reorder the terms:
5 + 7t + -5t2 = -5 + 5

Combine like terms: -5 + 5 = 0
5 + 7t + -5t2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-1 + -1.4t + t2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -1.4t + 1 + t2 = 0 + 1

Reorder the terms:
-1 + 1 + -1.4t + t2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1.4t + t2 = 0 + 1
-1.4t + t2 = 0 + 1

Combine like terms: 0 + 1 = 1
-1.4t + t2 = 1

The t term is -1.4t.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4t + 0.49 + t2 = 1 + 0.49

Reorder the terms:
0.49 + -1.4t + t2 = 1 + 0.49

Combine like terms: 1 + 0.49 = 1.49
0.49 + -1.4t + t2 = 1.49

Factor a perfect square on the left side:
(t + -0.7)(t + -0.7) = 1.49

Calculate the square root of the right side: 1.220655562

Break this problem into two subproblems by setting 
(t + -0.7) equal to 1.220655562 and -1.220655562.

Subproblem 1

t + -0.7 = 1.220655562 Simplifying t + -0.7 = 1.220655562 Reorder the terms: -0.7 + t = 1.220655562 Solving -0.7 + t = 1.220655562 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + t = 1.220655562 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + t = 1.220655562 + 0.7 t = 1.220655562 + 0.7 Combine like terms: 1.220655562 + 0.7 = 1.920655562 t = 1.920655562 Simplifying t = 1.920655562

Subproblem 2

t + -0.7 = -1.220655562 Simplifying t + -0.7 = -1.220655562 Reorder the terms: -0.7 + t = -1.220655562 Solving -0.7 + t = -1.220655562 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + t = -1.220655562 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + t = -1.220655562 + 0.7 t = -1.220655562 + 0.7 Combine like terms: -1.220655562 + 0.7 = -0.520655562 t = -0.520655562 Simplifying t = -0.520655562

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.920655562, -0.520655562}

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