0=50.0+2.1t-1.25t^2

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Solution for 0=50.0+2.1t-1.25t^2 equation:


Simplifying
0 = 50.0 + 2.1t + -1.25t2

Solving
0 = 50.0 + 2.1t + -1.25t2

Solving for variable 't'.

Combine like terms: 0 + -50.0 = -50
-50 + -2.1t + 1.25t2 = 50.0 + 2.1t + -1.25t2 + -50.0 + -2.1t + 1.25t2

Reorder the terms:
-50 + -2.1t + 1.25t2 = 50.0 + -50.0 + 2.1t + -2.1t + -1.25t2 + 1.25t2

Combine like terms: 50.0 + -50.0 = 0.0
-50 + -2.1t + 1.25t2 = 0.0 + 2.1t + -2.1t + -1.25t2 + 1.25t2
-50 + -2.1t + 1.25t2 = 2.1t + -2.1t + -1.25t2 + 1.25t2

Combine like terms: 2.1t + -2.1t = 0.0
-50 + -2.1t + 1.25t2 = 0.0 + -1.25t2 + 1.25t2
-50 + -2.1t + 1.25t2 = -1.25t2 + 1.25t2

Combine like terms: -1.25t2 + 1.25t2 = 0.00
-50 + -2.1t + 1.25t2 = 0.00

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

Divide each side by '1.25'.
-40 + -1.68t + t2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -1.68t + 40 + t2 = 0 + 40

Reorder the terms:
-40 + 40 + -1.68t + t2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -1.68t + t2 = 0 + 40
-1.68t + t2 = 0 + 40

Combine like terms: 0 + 40 = 40
-1.68t + t2 = 40

The t term is -1.68t.  Take half its coefficient (-0.84).
Square it (0.7056) and add it to both sides.

Add '0.7056' to each side of the equation.
-1.68t + 0.7056 + t2 = 40 + 0.7056

Reorder the terms:
0.7056 + -1.68t + t2 = 40 + 0.7056

Combine like terms: 40 + 0.7056 = 40.7056
0.7056 + -1.68t + t2 = 40.7056

Factor a perfect square on the left side:
(t + -0.84)(t + -0.84) = 40.7056

Calculate the square root of the right side: 6.380094043

Break this problem into two subproblems by setting 
(t + -0.84) equal to 6.380094043 and -6.380094043.

Subproblem 1

t + -0.84 = 6.380094043 Simplifying t + -0.84 = 6.380094043 Reorder the terms: -0.84 + t = 6.380094043 Solving -0.84 + t = 6.380094043 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.84' to each side of the equation. -0.84 + 0.84 + t = 6.380094043 + 0.84 Combine like terms: -0.84 + 0.84 = 0.00 0.00 + t = 6.380094043 + 0.84 t = 6.380094043 + 0.84 Combine like terms: 6.380094043 + 0.84 = 7.220094043 t = 7.220094043 Simplifying t = 7.220094043

Subproblem 2

t + -0.84 = -6.380094043 Simplifying t + -0.84 = -6.380094043 Reorder the terms: -0.84 + t = -6.380094043 Solving -0.84 + t = -6.380094043 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.84' to each side of the equation. -0.84 + 0.84 + t = -6.380094043 + 0.84 Combine like terms: -0.84 + 0.84 = 0.00 0.00 + t = -6.380094043 + 0.84 t = -6.380094043 + 0.84 Combine like terms: -6.380094043 + 0.84 = -5.540094043 t = -5.540094043 Simplifying t = -5.540094043

Solution

The solution to the problem is based on the solutions from the subproblems. t = {7.220094043, -5.540094043}

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