8t^2=-15t+9

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Solution for 8t^2=-15t+9 equation:


Simplifying
8t2 = -15t + 9

Reorder the terms:
8t2 = 9 + -15t

Solving
8t2 = 9 + -15t

Solving for variable 't'.

Reorder the terms:
-9 + 15t + 8t2 = 9 + -15t + -9 + 15t

Reorder the terms:
-9 + 15t + 8t2 = 9 + -9 + -15t + 15t

Combine like terms: 9 + -9 = 0
-9 + 15t + 8t2 = 0 + -15t + 15t
-9 + 15t + 8t2 = -15t + 15t

Combine like terms: -15t + 15t = 0
-9 + 15t + 8t2 = 0

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

Divide each side by '8'.
-1.125 + 1.875t + t2 = 0

Move the constant term to the right:

Add '1.125' to each side of the equation.
-1.125 + 1.875t + 1.125 + t2 = 0 + 1.125

Reorder the terms:
-1.125 + 1.125 + 1.875t + t2 = 0 + 1.125

Combine like terms: -1.125 + 1.125 = 0.000
0.000 + 1.875t + t2 = 0 + 1.125
1.875t + t2 = 0 + 1.125

Combine like terms: 0 + 1.125 = 1.125
1.875t + t2 = 1.125

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 = 1.125 + 0.87890625

Reorder the terms:
0.87890625 + 1.875t + t2 = 1.125 + 0.87890625

Combine like terms: 1.125 + 0.87890625 = 2.00390625
0.87890625 + 1.875t + t2 = 2.00390625

Factor a perfect square on the left side:
(t + 0.9375)(t + 0.9375) = 2.00390625

Calculate the square root of the right side: 1.415593957

Break this problem into two subproblems by setting 
(t + 0.9375) equal to 1.415593957 and -1.415593957.

Subproblem 1

t + 0.9375 = 1.415593957 Simplifying t + 0.9375 = 1.415593957 Reorder the terms: 0.9375 + t = 1.415593957 Solving 0.9375 + t = 1.415593957 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 = 1.415593957 + -0.9375 Combine like terms: 0.9375 + -0.9375 = 0.0000 0.0000 + t = 1.415593957 + -0.9375 t = 1.415593957 + -0.9375 Combine like terms: 1.415593957 + -0.9375 = 0.478093957 t = 0.478093957 Simplifying t = 0.478093957

Subproblem 2

t + 0.9375 = -1.415593957 Simplifying t + 0.9375 = -1.415593957 Reorder the terms: 0.9375 + t = -1.415593957 Solving 0.9375 + t = -1.415593957 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 = -1.415593957 + -0.9375 Combine like terms: 0.9375 + -0.9375 = 0.0000 0.0000 + t = -1.415593957 + -0.9375 t = -1.415593957 + -0.9375 Combine like terms: -1.415593957 + -0.9375 = -2.353093957 t = -2.353093957 Simplifying t = -2.353093957

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.478093957, -2.353093957}

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