10=-.50t^2+10.5t

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Solution for 10=-.50t^2+10.5t equation:


Simplifying
10 = -0.50t2 + 10.5t

Reorder the terms:
10 = 10.5t + -0.50t2

Solving
10 = 10.5t + -0.50t2

Solving for variable 't'.

Reorder the terms:
10 + -10.5t + 0.50t2 = 10.5t + -10.5t + -0.50t2 + 0.50t2

Combine like terms: 10.5t + -10.5t = 0.0
10 + -10.5t + 0.50t2 = 0.0 + -0.50t2 + 0.50t2
10 + -10.5t + 0.50t2 = -0.50t2 + 0.50t2

Combine like terms: -0.50t2 + 0.50t2 = 0.00
10 + -10.5t + 0.50t2 = 0.00

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

Divide each side by '0.50'.
20 + -21t + t2 = 0

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -21t + -20 + t2 = 0 + -20

Reorder the terms:
20 + -20 + -21t + t2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -21t + t2 = 0 + -20
-21t + t2 = 0 + -20

Combine like terms: 0 + -20 = -20
-21t + t2 = -20

The t term is -21t.  Take half its coefficient (-10.5).
Square it (110.25) and add it to both sides.

Add '110.25' to each side of the equation.
-21t + 110.25 + t2 = -20 + 110.25

Reorder the terms:
110.25 + -21t + t2 = -20 + 110.25

Combine like terms: -20 + 110.25 = 90.25
110.25 + -21t + t2 = 90.25

Factor a perfect square on the left side:
(t + -10.5)(t + -10.5) = 90.25

Calculate the square root of the right side: 9.5

Break this problem into two subproblems by setting 
(t + -10.5) equal to 9.5 and -9.5.

Subproblem 1

t + -10.5 = 9.5 Simplifying t + -10.5 = 9.5 Reorder the terms: -10.5 + t = 9.5 Solving -10.5 + t = 9.5 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '10.5' to each side of the equation. -10.5 + 10.5 + t = 9.5 + 10.5 Combine like terms: -10.5 + 10.5 = 0.0 0.0 + t = 9.5 + 10.5 t = 9.5 + 10.5 Combine like terms: 9.5 + 10.5 = 20 t = 20 Simplifying t = 20

Subproblem 2

t + -10.5 = -9.5 Simplifying t + -10.5 = -9.5 Reorder the terms: -10.5 + t = -9.5 Solving -10.5 + t = -9.5 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '10.5' to each side of the equation. -10.5 + 10.5 + t = -9.5 + 10.5 Combine like terms: -10.5 + 10.5 = 0.0 0.0 + t = -9.5 + 10.5 t = -9.5 + 10.5 Combine like terms: -9.5 + 10.5 = 1 t = 1 Simplifying t = 1

Solution

The solution to the problem is based on the solutions from the subproblems. t = {20, 1}

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