90=50t+12.5t^2

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Solution for 90=50t+12.5t^2 equation:


Simplifying
90 = 50t + 12.5t2

Solving
90 = 50t + 12.5t2

Solving for variable 't'.

Reorder the terms:
90 + -50t + -12.5t2 = 50t + -50t + 12.5t2 + -12.5t2

Combine like terms: 50t + -50t = 0
90 + -50t + -12.5t2 = 0 + 12.5t2 + -12.5t2
90 + -50t + -12.5t2 = 12.5t2 + -12.5t2

Combine like terms: 12.5t2 + -12.5t2 = 0.0
90 + -50t + -12.5t2 = 0.0

Begin completing the square.  Divide all terms by
-12.5 the coefficient of the squared term: 

Divide each side by '-12.5'.
-7.2 + 4t + t2 = 0

Move the constant term to the right:

Add '7.2' to each side of the equation.
-7.2 + 4t + 7.2 + t2 = 0 + 7.2

Reorder the terms:
-7.2 + 7.2 + 4t + t2 = 0 + 7.2

Combine like terms: -7.2 + 7.2 = 0.0
0.0 + 4t + t2 = 0 + 7.2
4t + t2 = 0 + 7.2

Combine like terms: 0 + 7.2 = 7.2
4t + t2 = 7.2

The t term is 4t.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4t + 4 + t2 = 7.2 + 4

Reorder the terms:
4 + 4t + t2 = 7.2 + 4

Combine like terms: 7.2 + 4 = 11.2
4 + 4t + t2 = 11.2

Factor a perfect square on the left side:
(t + 2)(t + 2) = 11.2

Calculate the square root of the right side: 3.346640106

Break this problem into two subproblems by setting 
(t + 2) equal to 3.346640106 and -3.346640106.

Subproblem 1

t + 2 = 3.346640106 Simplifying t + 2 = 3.346640106 Reorder the terms: 2 + t = 3.346640106 Solving 2 + t = 3.346640106 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + t = 3.346640106 + -2 Combine like terms: 2 + -2 = 0 0 + t = 3.346640106 + -2 t = 3.346640106 + -2 Combine like terms: 3.346640106 + -2 = 1.346640106 t = 1.346640106 Simplifying t = 1.346640106

Subproblem 2

t + 2 = -3.346640106 Simplifying t + 2 = -3.346640106 Reorder the terms: 2 + t = -3.346640106 Solving 2 + t = -3.346640106 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + t = -3.346640106 + -2 Combine like terms: 2 + -2 = 0 0 + t = -3.346640106 + -2 t = -3.346640106 + -2 Combine like terms: -3.346640106 + -2 = -5.346640106 t = -5.346640106 Simplifying t = -5.346640106

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.346640106, -5.346640106}

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