30=t(4.9t+5)

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Solution for 30=t(4.9t+5) equation:


Simplifying
30 = t(4.9t + 5)

Reorder the terms:
30 = t(5 + 4.9t)
30 = (5 * t + 4.9t * t)
30 = (5t + 4.9t2)

Solving
30 = 5t + 4.9t2

Solving for variable 't'.

Reorder the terms:
30 + -5t + -4.9t2 = 5t + -5t + 4.9t2 + -4.9t2

Combine like terms: 5t + -5t = 0
30 + -5t + -4.9t2 = 0 + 4.9t2 + -4.9t2
30 + -5t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
30 + -5t + -4.9t2 = 0.0

Begin completing the square.  Divide all terms by
-4.9 the coefficient of the squared term: 

Divide each side by '-4.9'.
-6.12244898 + 1.020408163t + t2 = 0

Move the constant term to the right:

Add '6.12244898' to each side of the equation.
-6.12244898 + 1.020408163t + 6.12244898 + t2 = 0 + 6.12244898

Reorder the terms:
-6.12244898 + 6.12244898 + 1.020408163t + t2 = 0 + 6.12244898

Combine like terms: -6.12244898 + 6.12244898 = 0.00000000
0.00000000 + 1.020408163t + t2 = 0 + 6.12244898
1.020408163t + t2 = 0 + 6.12244898

Combine like terms: 0 + 6.12244898 = 6.12244898
1.020408163t + t2 = 6.12244898

The t term is 1.020408163t.  Take half its coefficient (0.5102040815).
Square it (0.2603082048) and add it to both sides.

Add '0.2603082048' to each side of the equation.
1.020408163t + 0.2603082048 + t2 = 6.12244898 + 0.2603082048

Reorder the terms:
0.2603082048 + 1.020408163t + t2 = 6.12244898 + 0.2603082048

Combine like terms: 6.12244898 + 0.2603082048 = 6.3827571848
0.2603082048 + 1.020408163t + t2 = 6.3827571848

Factor a perfect square on the left side:
(t + 0.5102040815)(t + 0.5102040815) = 6.3827571848

Calculate the square root of the right side: 2.526411919

Break this problem into two subproblems by setting 
(t + 0.5102040815) equal to 2.526411919 and -2.526411919.

Subproblem 1

t + 0.5102040815 = 2.526411919 Simplifying t + 0.5102040815 = 2.526411919 Reorder the terms: 0.5102040815 + t = 2.526411919 Solving 0.5102040815 + t = 2.526411919 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5102040815' to each side of the equation. 0.5102040815 + -0.5102040815 + t = 2.526411919 + -0.5102040815 Combine like terms: 0.5102040815 + -0.5102040815 = 0.0000000000 0.0000000000 + t = 2.526411919 + -0.5102040815 t = 2.526411919 + -0.5102040815 Combine like terms: 2.526411919 + -0.5102040815 = 2.0162078375 t = 2.0162078375 Simplifying t = 2.0162078375

Subproblem 2

t + 0.5102040815 = -2.526411919 Simplifying t + 0.5102040815 = -2.526411919 Reorder the terms: 0.5102040815 + t = -2.526411919 Solving 0.5102040815 + t = -2.526411919 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5102040815' to each side of the equation. 0.5102040815 + -0.5102040815 + t = -2.526411919 + -0.5102040815 Combine like terms: 0.5102040815 + -0.5102040815 = 0.0000000000 0.0000000000 + t = -2.526411919 + -0.5102040815 t = -2.526411919 + -0.5102040815 Combine like terms: -2.526411919 + -0.5102040815 = -3.0366160005 t = -3.0366160005 Simplifying t = -3.0366160005

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.0162078375, -3.0366160005}

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