100=.2t^2+3t+10.4

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Solution for 100=.2t^2+3t+10.4 equation:


Simplifying
100 = 0.2t2 + 3t + 10.4

Reorder the terms:
100 = 10.4 + 3t + 0.2t2

Solving
100 = 10.4 + 3t + 0.2t2

Solving for variable 't'.

Combine like terms: 100 + -10.4 = 89.6
89.6 + -3t + -0.2t2 = 10.4 + 3t + 0.2t2 + -10.4 + -3t + -0.2t2

Reorder the terms:
89.6 + -3t + -0.2t2 = 10.4 + -10.4 + 3t + -3t + 0.2t2 + -0.2t2

Combine like terms: 10.4 + -10.4 = 0.0
89.6 + -3t + -0.2t2 = 0.0 + 3t + -3t + 0.2t2 + -0.2t2
89.6 + -3t + -0.2t2 = 3t + -3t + 0.2t2 + -0.2t2

Combine like terms: 3t + -3t = 0
89.6 + -3t + -0.2t2 = 0 + 0.2t2 + -0.2t2
89.6 + -3t + -0.2t2 = 0.2t2 + -0.2t2

Combine like terms: 0.2t2 + -0.2t2 = 0.0
89.6 + -3t + -0.2t2 = 0.0

Begin completing the square.  Divide all terms by
-0.2 the coefficient of the squared term: 

Divide each side by '-0.2'.
-448 + 15t + t2 = 0

Move the constant term to the right:

Add '448' to each side of the equation.
-448 + 15t + 448 + t2 = 0 + 448

Reorder the terms:
-448 + 448 + 15t + t2 = 0 + 448

Combine like terms: -448 + 448 = 0
0 + 15t + t2 = 0 + 448
15t + t2 = 0 + 448

Combine like terms: 0 + 448 = 448
15t + t2 = 448

The t term is 15t.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15t + 56.25 + t2 = 448 + 56.25

Reorder the terms:
56.25 + 15t + t2 = 448 + 56.25

Combine like terms: 448 + 56.25 = 504.25
56.25 + 15t + t2 = 504.25

Factor a perfect square on the left side:
(t + 7.5)(t + 7.5) = 504.25

Calculate the square root of the right side: 22.455511573

Break this problem into two subproblems by setting 
(t + 7.5) equal to 22.455511573 and -22.455511573.

Subproblem 1

t + 7.5 = 22.455511573 Simplifying t + 7.5 = 22.455511573 Reorder the terms: 7.5 + t = 22.455511573 Solving 7.5 + t = 22.455511573 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + t = 22.455511573 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + t = 22.455511573 + -7.5 t = 22.455511573 + -7.5 Combine like terms: 22.455511573 + -7.5 = 14.955511573 t = 14.955511573 Simplifying t = 14.955511573

Subproblem 2

t + 7.5 = -22.455511573 Simplifying t + 7.5 = -22.455511573 Reorder the terms: 7.5 + t = -22.455511573 Solving 7.5 + t = -22.455511573 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + t = -22.455511573 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + t = -22.455511573 + -7.5 t = -22.455511573 + -7.5 Combine like terms: -22.455511573 + -7.5 = -29.955511573 t = -29.955511573 Simplifying t = -29.955511573

Solution

The solution to the problem is based on the solutions from the subproblems. t = {14.955511573, -29.955511573}

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