0=-10t^2+8t+.2

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Solution for 0=-10t^2+8t+.2 equation:


Simplifying
0 = -10t2 + 8t + 0.2

Reorder the terms:
0 = 0.2 + 8t + -10t2

Solving
0 = 0.2 + 8t + -10t2

Solving for variable 't'.

Combine like terms: 0 + -0.2 = -0.2
-0.2 + -8t + 10t2 = 0.2 + 8t + -10t2 + -0.2 + -8t + 10t2

Reorder the terms:
-0.2 + -8t + 10t2 = 0.2 + -0.2 + 8t + -8t + -10t2 + 10t2

Combine like terms: 0.2 + -0.2 = 0.0
-0.2 + -8t + 10t2 = 0.0 + 8t + -8t + -10t2 + 10t2
-0.2 + -8t + 10t2 = 8t + -8t + -10t2 + 10t2

Combine like terms: 8t + -8t = 0
-0.2 + -8t + 10t2 = 0 + -10t2 + 10t2
-0.2 + -8t + 10t2 = -10t2 + 10t2

Combine like terms: -10t2 + 10t2 = 0
-0.2 + -8t + 10t2 = 0

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

Divide each side by '10'.
-0.02 + -0.8t + t2 = 0

Move the constant term to the right:

Add '0.02' to each side of the equation.
-0.02 + -0.8t + 0.02 + t2 = 0 + 0.02

Reorder the terms:
-0.02 + 0.02 + -0.8t + t2 = 0 + 0.02

Combine like terms: -0.02 + 0.02 = 0.00
0.00 + -0.8t + t2 = 0 + 0.02
-0.8t + t2 = 0 + 0.02

Combine like terms: 0 + 0.02 = 0.02
-0.8t + t2 = 0.02

The t term is -0.8t.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8t + 0.16 + t2 = 0.02 + 0.16

Reorder the terms:
0.16 + -0.8t + t2 = 0.02 + 0.16

Combine like terms: 0.02 + 0.16 = 0.18
0.16 + -0.8t + t2 = 0.18

Factor a perfect square on the left side:
(t + -0.4)(t + -0.4) = 0.18

Calculate the square root of the right side: 0.424264069

Break this problem into two subproblems by setting 
(t + -0.4) equal to 0.424264069 and -0.424264069.

Subproblem 1

t + -0.4 = 0.424264069 Simplifying t + -0.4 = 0.424264069 Reorder the terms: -0.4 + t = 0.424264069 Solving -0.4 + t = 0.424264069 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + t = 0.424264069 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + t = 0.424264069 + 0.4 t = 0.424264069 + 0.4 Combine like terms: 0.424264069 + 0.4 = 0.824264069 t = 0.824264069 Simplifying t = 0.824264069

Subproblem 2

t + -0.4 = -0.424264069 Simplifying t + -0.4 = -0.424264069 Reorder the terms: -0.4 + t = -0.424264069 Solving -0.4 + t = -0.424264069 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + t = -0.424264069 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + t = -0.424264069 + 0.4 t = -0.424264069 + 0.4 Combine like terms: -0.424264069 + 0.4 = -0.024264069 t = -0.024264069 Simplifying t = -0.024264069

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.824264069, -0.024264069}

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