0=-8t^2+15t+3

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Solution for 0=-8t^2+15t+3 equation:


Simplifying
0 = -8t2 + 15t + 3

Reorder the terms:
0 = 3 + 15t + -8t2

Solving
0 = 3 + 15t + -8t2

Solving for variable 't'.

Combine like terms: 0 + -3 = -3
-3 + -15t + 8t2 = 3 + 15t + -8t2 + -3 + -15t + 8t2

Reorder the terms:
-3 + -15t + 8t2 = 3 + -3 + 15t + -15t + -8t2 + 8t2

Combine like terms: 3 + -3 = 0
-3 + -15t + 8t2 = 0 + 15t + -15t + -8t2 + 8t2
-3 + -15t + 8t2 = 15t + -15t + -8t2 + 8t2

Combine like terms: 15t + -15t = 0
-3 + -15t + 8t2 = 0 + -8t2 + 8t2
-3 + -15t + 8t2 = -8t2 + 8t2

Combine like terms: -8t2 + 8t2 = 0
-3 + -15t + 8t2 = 0

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

Divide each side by '8'.
-0.375 + -1.875t + t2 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + -1.875t + 0.375 + t2 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + -1.875t + t2 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + -1.875t + t2 = 0 + 0.375
-1.875t + t2 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
-1.875t + t2 = 0.375

The t term is -1.875t.  Take half its coefficient (-0.9375).
Square it (0.87890625) and add it to both sides.

Add '0.87890625' to each side of the equation.
-1.875t + 0.87890625 + t2 = 0.375 + 0.87890625

Reorder the terms:
0.87890625 + -1.875t + t2 = 0.375 + 0.87890625

Combine like terms: 0.375 + 0.87890625 = 1.25390625
0.87890625 + -1.875t + t2 = 1.25390625

Factor a perfect square on the left side:
(t + -0.9375)(t + -0.9375) = 1.25390625

Calculate the square root of the right side: 1.119779554

Break this problem into two subproblems by setting 
(t + -0.9375) equal to 1.119779554 and -1.119779554.

Subproblem 1

t + -0.9375 = 1.119779554 Simplifying t + -0.9375 = 1.119779554 Reorder the terms: -0.9375 + t = 1.119779554 Solving -0.9375 + t = 1.119779554 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.9375' to each side of the equation. -0.9375 + 0.9375 + t = 1.119779554 + 0.9375 Combine like terms: -0.9375 + 0.9375 = 0.0000 0.0000 + t = 1.119779554 + 0.9375 t = 1.119779554 + 0.9375 Combine like terms: 1.119779554 + 0.9375 = 2.057279554 t = 2.057279554 Simplifying t = 2.057279554

Subproblem 2

t + -0.9375 = -1.119779554 Simplifying t + -0.9375 = -1.119779554 Reorder the terms: -0.9375 + t = -1.119779554 Solving -0.9375 + t = -1.119779554 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.9375' to each side of the equation. -0.9375 + 0.9375 + t = -1.119779554 + 0.9375 Combine like terms: -0.9375 + 0.9375 = 0.0000 0.0000 + t = -1.119779554 + 0.9375 t = -1.119779554 + 0.9375 Combine like terms: -1.119779554 + 0.9375 = -0.182279554 t = -0.182279554 Simplifying t = -0.182279554

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.057279554, -0.182279554}

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