-5t^2+15t+3.75=0

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Solution for -5t^2+15t+3.75=0 equation:


Simplifying
-5t2 + 15t + 3.75 = 0

Reorder the terms:
3.75 + 15t + -5t2 = 0

Solving
3.75 + 15t + -5t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-0.75 + -3t + t2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + -3t + 0.75 + t2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + -3t + t2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + -3t + t2 = 0 + 0.75
-3t + t2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
-3t + t2 = 0.75

The t term is -3t.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3t + 2.25 + t2 = 0.75 + 2.25

Reorder the terms:
2.25 + -3t + t2 = 0.75 + 2.25

Combine like terms: 0.75 + 2.25 = 3
2.25 + -3t + t2 = 3

Factor a perfect square on the left side:
(t + -1.5)(t + -1.5) = 3

Calculate the square root of the right side: 1.732050808

Break this problem into two subproblems by setting 
(t + -1.5) equal to 1.732050808 and -1.732050808.

Subproblem 1

t + -1.5 = 1.732050808 Simplifying t + -1.5 = 1.732050808 Reorder the terms: -1.5 + t = 1.732050808 Solving -1.5 + t = 1.732050808 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + t = 1.732050808 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + t = 1.732050808 + 1.5 t = 1.732050808 + 1.5 Combine like terms: 1.732050808 + 1.5 = 3.232050808 t = 3.232050808 Simplifying t = 3.232050808

Subproblem 2

t + -1.5 = -1.732050808 Simplifying t + -1.5 = -1.732050808 Reorder the terms: -1.5 + t = -1.732050808 Solving -1.5 + t = -1.732050808 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + t = -1.732050808 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + t = -1.732050808 + 1.5 t = -1.732050808 + 1.5 Combine like terms: -1.732050808 + 1.5 = -0.232050808 t = -0.232050808 Simplifying t = -0.232050808

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.232050808, -0.232050808}

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