10=7+20t-16t^2

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Solution for 10=7+20t-16t^2 equation:


Simplifying
10 = 7 + 20t + -16t2

Solving
10 = 7 + 20t + -16t2

Solving for variable 't'.

Combine like terms: 10 + -7 = 3
3 + -20t + 16t2 = 7 + 20t + -16t2 + -7 + -20t + 16t2

Reorder the terms:
3 + -20t + 16t2 = 7 + -7 + 20t + -20t + -16t2 + 16t2

Combine like terms: 7 + -7 = 0
3 + -20t + 16t2 = 0 + 20t + -20t + -16t2 + 16t2
3 + -20t + 16t2 = 20t + -20t + -16t2 + 16t2

Combine like terms: 20t + -20t = 0
3 + -20t + 16t2 = 0 + -16t2 + 16t2
3 + -20t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
3 + -20t + 16t2 = 0

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

Divide each side by '16'.
0.1875 + -1.25t + t2 = 0

Move the constant term to the right:

Add '-0.1875' to each side of the equation.
0.1875 + -1.25t + -0.1875 + t2 = 0 + -0.1875

Reorder the terms:
0.1875 + -0.1875 + -1.25t + t2 = 0 + -0.1875

Combine like terms: 0.1875 + -0.1875 = 0.0000
0.0000 + -1.25t + t2 = 0 + -0.1875
-1.25t + t2 = 0 + -0.1875

Combine like terms: 0 + -0.1875 = -0.1875
-1.25t + t2 = -0.1875

The t term is -1.25t.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25t + 0.390625 + t2 = -0.1875 + 0.390625

Reorder the terms:
0.390625 + -1.25t + t2 = -0.1875 + 0.390625

Combine like terms: -0.1875 + 0.390625 = 0.203125
0.390625 + -1.25t + t2 = 0.203125

Factor a perfect square on the left side:
(t + -0.625)(t + -0.625) = 0.203125

Calculate the square root of the right side: 0.450693909

Break this problem into two subproblems by setting 
(t + -0.625) equal to 0.450693909 and -0.450693909.

Subproblem 1

t + -0.625 = 0.450693909 Simplifying t + -0.625 = 0.450693909 Reorder the terms: -0.625 + t = 0.450693909 Solving -0.625 + t = 0.450693909 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = 0.450693909 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = 0.450693909 + 0.625 t = 0.450693909 + 0.625 Combine like terms: 0.450693909 + 0.625 = 1.075693909 t = 1.075693909 Simplifying t = 1.075693909

Subproblem 2

t + -0.625 = -0.450693909 Simplifying t + -0.625 = -0.450693909 Reorder the terms: -0.625 + t = -0.450693909 Solving -0.625 + t = -0.450693909 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = -0.450693909 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = -0.450693909 + 0.625 t = -0.450693909 + 0.625 Combine like terms: -0.450693909 + 0.625 = 0.174306091 t = 0.174306091 Simplifying t = 0.174306091

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.075693909, 0.174306091}

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