(4+5)t^2+4(4t)+4(4)-625=0

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Solution for (4+5)t^2+4(4t)+4(4)-625=0 equation:


Simplifying
(4 + 5) * t2 + 4(4t) + 4(4) + -625 = 0

Combine like terms: 4 + 5 = 9
(9) * t2 + 4(4t) + 4(4) + -625 = 0

Remove parenthesis around (4t)
9t2 + 4 * 4t + 4(4) + -625 = 0

Multiply 4 * 4
9t2 + 16t + 4(4) + -625 = 0

Multiply 4 * 4
9t2 + 16t + 16 + -625 = 0

Reorder the terms:
16 + -625 + 16t + 9t2 = 0

Combine like terms: 16 + -625 = -609
-609 + 16t + 9t2 = 0

Solving
-609 + 16t + 9t2 = 0

Solving for variable 't'.

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

Divide each side by '9'.
-67.66666667 + 1.777777778t + t2 = 0

Move the constant term to the right:

Add '67.66666667' to each side of the equation.
-67.66666667 + 1.777777778t + 67.66666667 + t2 = 0 + 67.66666667

Reorder the terms:
-67.66666667 + 67.66666667 + 1.777777778t + t2 = 0 + 67.66666667

Combine like terms: -67.66666667 + 67.66666667 = 0.00000000
0.00000000 + 1.777777778t + t2 = 0 + 67.66666667
1.777777778t + t2 = 0 + 67.66666667

Combine like terms: 0 + 67.66666667 = 67.66666667
1.777777778t + t2 = 67.66666667

The t term is 1.777777778t.  Take half its coefficient (0.888888889).
Square it (0.7901234570) and add it to both sides.

Add '0.7901234570' to each side of the equation.
1.777777778t + 0.7901234570 + t2 = 67.66666667 + 0.7901234570

Reorder the terms:
0.7901234570 + 1.777777778t + t2 = 67.66666667 + 0.7901234570

Combine like terms: 67.66666667 + 0.7901234570 = 68.456790127
0.7901234570 + 1.777777778t + t2 = 68.456790127

Factor a perfect square on the left side:
(t + 0.888888889)(t + 0.888888889) = 68.456790127

Calculate the square root of the right side: 8.273861863

Break this problem into two subproblems by setting 
(t + 0.888888889) equal to 8.273861863 and -8.273861863.

Subproblem 1

t + 0.888888889 = 8.273861863 Simplifying t + 0.888888889 = 8.273861863 Reorder the terms: 0.888888889 + t = 8.273861863 Solving 0.888888889 + t = 8.273861863 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.888888889' to each side of the equation. 0.888888889 + -0.888888889 + t = 8.273861863 + -0.888888889 Combine like terms: 0.888888889 + -0.888888889 = 0.000000000 0.000000000 + t = 8.273861863 + -0.888888889 t = 8.273861863 + -0.888888889 Combine like terms: 8.273861863 + -0.888888889 = 7.384972974 t = 7.384972974 Simplifying t = 7.384972974

Subproblem 2

t + 0.888888889 = -8.273861863 Simplifying t + 0.888888889 = -8.273861863 Reorder the terms: 0.888888889 + t = -8.273861863 Solving 0.888888889 + t = -8.273861863 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.888888889' to each side of the equation. 0.888888889 + -0.888888889 + t = -8.273861863 + -0.888888889 Combine like terms: 0.888888889 + -0.888888889 = 0.000000000 0.000000000 + t = -8.273861863 + -0.888888889 t = -8.273861863 + -0.888888889 Combine like terms: -8.273861863 + -0.888888889 = -9.162750752 t = -9.162750752 Simplifying t = -9.162750752

Solution

The solution to the problem is based on the solutions from the subproblems. t = {7.384972974, -9.162750752}

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