0.2t^2-3t-8.75=0

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Solution for 0.2t^2-3t-8.75=0 equation:


Simplifying
0.2t2 + -3t + -8.75 = 0

Reorder the terms:
-8.75 + -3t + 0.2t2 = 0

Solving
-8.75 + -3t + 0.2t2 = 0

Solving for variable 't'.

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

Divide each side by '0.2'.
-43.75 + -15t + t2 = 0

Move the constant term to the right:

Add '43.75' to each side of the equation.
-43.75 + -15t + 43.75 + t2 = 0 + 43.75

Reorder the terms:
-43.75 + 43.75 + -15t + t2 = 0 + 43.75

Combine like terms: -43.75 + 43.75 = 0.00
0.00 + -15t + t2 = 0 + 43.75
-15t + t2 = 0 + 43.75

Combine like terms: 0 + 43.75 = 43.75
-15t + t2 = 43.75

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 = 43.75 + 56.25

Reorder the terms:
56.25 + -15t + t2 = 43.75 + 56.25

Combine like terms: 43.75 + 56.25 = 100
56.25 + -15t + t2 = 100

Factor a perfect square on the left side:
(t + -7.5)(t + -7.5) = 100

Calculate the square root of the right side: 10

Break this problem into two subproblems by setting 
(t + -7.5) equal to 10 and -10.

Subproblem 1

t + -7.5 = 10 Simplifying t + -7.5 = 10 Reorder the terms: -7.5 + t = 10 Solving -7.5 + t = 10 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 = 10 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + t = 10 + 7.5 t = 10 + 7.5 Combine like terms: 10 + 7.5 = 17.5 t = 17.5 Simplifying t = 17.5

Subproblem 2

t + -7.5 = -10 Simplifying t + -7.5 = -10 Reorder the terms: -7.5 + t = -10 Solving -7.5 + t = -10 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 = -10 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + t = -10 + 7.5 t = -10 + 7.5 Combine like terms: -10 + 7.5 = -2.5 t = -2.5 Simplifying t = -2.5

Solution

The solution to the problem is based on the solutions from the subproblems. t = {17.5, -2.5}

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