(5*t*t)-(4*t)-4200=0

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Solution for (5*t*t)-(4*t)-4200=0 equation:


Simplifying
(5t * t) + -1(4t) + -4200 = 0

Multiply t * t
(5t2) + -1(4t) + -4200 = 0

Remove parenthesis around (4t)
(5t2) + -1 * 4t + -4200 = 0

Multiply -1 * 4
(5t2) + -4t + -4200 = 0

Reorder the terms:
-4200 + -4t + (5t2) = 0

Solving
-4200 + -4t + (5t2) = 0

Solving for variable 't'.

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

Divide each side by '5'.
-840 + -0.8t + t2 = 0

Move the constant term to the right:

Add '840' to each side of the equation.
-840 + -0.8t + 840 + t2 = 0 + 840

Reorder the terms:
-840 + 840 + -0.8t + t2 = 0 + 840

Combine like terms: -840 + 840 = 0
0 + -0.8t + t2 = 0 + 840
-0.8t + t2 = 0 + 840

Combine like terms: 0 + 840 = 840
-0.8t + t2 = 840

The t term is -0.8t.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8t + 0.16 + t2 = 840 + 0.16

Reorder the terms:
0.16 + -0.8t + t2 = 840 + 0.16

Combine like terms: 840 + 0.16 = 840.16
0.16 + -0.8t + t2 = 840.16

Factor a perfect square on the left side:
((t) + -0.4)((t) + -0.4) = 840.16

Calculate the square root of the right side: 28.985513623

Break this problem into two subproblems by setting 
((t) + -0.4) equal to 28.985513623 and -28.985513623.

Subproblem 1

(t) + -0.4 = 28.985513623 Simplifying (t) + -0.4 = 28.985513623 t + -0.4 = 28.985513623 Reorder the terms: -0.4 + t = 28.985513623 Solving -0.4 + t = 28.985513623 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + t = 28.985513623 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + t = 28.985513623 + 0.4 t = 28.985513623 + 0.4 Combine like terms: 28.985513623 + 0.4 = 29.385513623 t = 29.385513623 Simplifying t = 29.385513623

Subproblem 2

(t) + -0.4 = -28.985513623 Simplifying (t) + -0.4 = -28.985513623 t + -0.4 = -28.985513623 Reorder the terms: -0.4 + t = -28.985513623 Solving -0.4 + t = -28.985513623 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + t = -28.985513623 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + t = -28.985513623 + 0.4 t = -28.985513623 + 0.4 Combine like terms: -28.985513623 + 0.4 = -28.585513623 t = -28.585513623 Simplifying t = -28.585513623

Solution

The solution to the problem is based on the solutions from the subproblems. t = {29.385513623, -28.585513623}

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