25=10t-.83t^2

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Solution for 25=10t-.83t^2 equation:


Simplifying
25 = 10t + -0.83t2

Solving
25 = 10t + -0.83t2

Solving for variable 't'.

Reorder the terms:
25 + -10t + 0.83t2 = 10t + -10t + -0.83t2 + 0.83t2

Combine like terms: 10t + -10t = 0
25 + -10t + 0.83t2 = 0 + -0.83t2 + 0.83t2
25 + -10t + 0.83t2 = -0.83t2 + 0.83t2

Combine like terms: -0.83t2 + 0.83t2 = 0.00
25 + -10t + 0.83t2 = 0.00

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

Divide each side by '0.83'.
30.12048193 + -12.04819277t + t2 = 0

Move the constant term to the right:

Add '-30.12048193' to each side of the equation.
30.12048193 + -12.04819277t + -30.12048193 + t2 = 0 + -30.12048193

Reorder the terms:
30.12048193 + -30.12048193 + -12.04819277t + t2 = 0 + -30.12048193

Combine like terms: 30.12048193 + -30.12048193 = 0.00000000
0.00000000 + -12.04819277t + t2 = 0 + -30.12048193
-12.04819277t + t2 = 0 + -30.12048193

Combine like terms: 0 + -30.12048193 = -30.12048193
-12.04819277t + t2 = -30.12048193

The t term is -12.04819277t.  Take half its coefficient (-6.024096385).
Square it (36.28973726) and add it to both sides.

Add '36.28973726' to each side of the equation.
-12.04819277t + 36.28973726 + t2 = -30.12048193 + 36.28973726

Reorder the terms:
36.28973726 + -12.04819277t + t2 = -30.12048193 + 36.28973726

Combine like terms: -30.12048193 + 36.28973726 = 6.16925533
36.28973726 + -12.04819277t + t2 = 6.16925533

Factor a perfect square on the left side:
(t + -6.024096385)(t + -6.024096385) = 6.16925533

Calculate the square root of the right side: 2.483798569

Break this problem into two subproblems by setting 
(t + -6.024096385) equal to 2.483798569 and -2.483798569.

Subproblem 1

t + -6.024096385 = 2.483798569 Simplifying t + -6.024096385 = 2.483798569 Reorder the terms: -6.024096385 + t = 2.483798569 Solving -6.024096385 + t = 2.483798569 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6.024096385' to each side of the equation. -6.024096385 + 6.024096385 + t = 2.483798569 + 6.024096385 Combine like terms: -6.024096385 + 6.024096385 = 0.000000000 0.000000000 + t = 2.483798569 + 6.024096385 t = 2.483798569 + 6.024096385 Combine like terms: 2.483798569 + 6.024096385 = 8.507894954 t = 8.507894954 Simplifying t = 8.507894954

Subproblem 2

t + -6.024096385 = -2.483798569 Simplifying t + -6.024096385 = -2.483798569 Reorder the terms: -6.024096385 + t = -2.483798569 Solving -6.024096385 + t = -2.483798569 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6.024096385' to each side of the equation. -6.024096385 + 6.024096385 + t = -2.483798569 + 6.024096385 Combine like terms: -6.024096385 + 6.024096385 = 0.000000000 0.000000000 + t = -2.483798569 + 6.024096385 t = -2.483798569 + 6.024096385 Combine like terms: -2.483798569 + 6.024096385 = 3.540297816 t = 3.540297816 Simplifying t = 3.540297816

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.507894954, 3.540297816}

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