.5t+.5t(t-.1)=1.88

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Solution for .5t+.5t(t-.1)=1.88 equation:


Simplifying
0.5t + 0.5t(t + -0.1) = 1.88

Reorder the terms:
0.5t + 0.5t(-0.1 + t) = 1.88
0.5t + (-0.1 * 0.5t + t * 0.5t) = 1.88
0.5t + (-0.05t + 0.5t2) = 1.88

Combine like terms: 0.5t + -0.05t = 0.45t
0.45t + 0.5t2 = 1.88

Solving
0.45t + 0.5t2 = 1.88

Solving for variable 't'.

Reorder the terms:
-1.88 + 0.45t + 0.5t2 = 1.88 + -1.88

Combine like terms: 1.88 + -1.88 = 0.00
-1.88 + 0.45t + 0.5t2 = 0.00

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

Divide each side by '0.5'.
-3.76 + 0.9t + t2 = 0.0

Move the constant term to the right:

Add '3.76' to each side of the equation.
-3.76 + 0.9t + 3.76 + t2 = 0.0 + 3.76

Reorder the terms:
-3.76 + 3.76 + 0.9t + t2 = 0.0 + 3.76

Combine like terms: -3.76 + 3.76 = 0.00
0.00 + 0.9t + t2 = 0.0 + 3.76
0.9t + t2 = 0.0 + 3.76

Combine like terms: 0.0 + 3.76 = 3.76
0.9t + t2 = 3.76

The t term is 0.9t.  Take half its coefficient (0.45).
Square it (0.2025) and add it to both sides.

Add '0.2025' to each side of the equation.
0.9t + 0.2025 + t2 = 3.76 + 0.2025

Reorder the terms:
0.2025 + 0.9t + t2 = 3.76 + 0.2025

Combine like terms: 3.76 + 0.2025 = 3.9625
0.2025 + 0.9t + t2 = 3.9625

Factor a perfect square on the left side:
(t + 0.45)(t + 0.45) = 3.9625

Calculate the square root of the right side: 1.990602924

Break this problem into two subproblems by setting 
(t + 0.45) equal to 1.990602924 and -1.990602924.

Subproblem 1

t + 0.45 = 1.990602924 Simplifying t + 0.45 = 1.990602924 Reorder the terms: 0.45 + t = 1.990602924 Solving 0.45 + t = 1.990602924 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.45' to each side of the equation. 0.45 + -0.45 + t = 1.990602924 + -0.45 Combine like terms: 0.45 + -0.45 = 0.00 0.00 + t = 1.990602924 + -0.45 t = 1.990602924 + -0.45 Combine like terms: 1.990602924 + -0.45 = 1.540602924 t = 1.540602924 Simplifying t = 1.540602924

Subproblem 2

t + 0.45 = -1.990602924 Simplifying t + 0.45 = -1.990602924 Reorder the terms: 0.45 + t = -1.990602924 Solving 0.45 + t = -1.990602924 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.45' to each side of the equation. 0.45 + -0.45 + t = -1.990602924 + -0.45 Combine like terms: 0.45 + -0.45 = 0.00 0.00 + t = -1.990602924 + -0.45 t = -1.990602924 + -0.45 Combine like terms: -1.990602924 + -0.45 = -2.440602924 t = -2.440602924 Simplifying t = -2.440602924

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.540602924, -2.440602924}

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