85=175t+16t^2

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Solution for 85=175t+16t^2 equation:


Simplifying
85 = 175t + 16t2

Solving
85 = 175t + 16t2

Solving for variable 't'.

Reorder the terms:
85 + -175t + -16t2 = 175t + -175t + 16t2 + -16t2

Combine like terms: 175t + -175t = 0
85 + -175t + -16t2 = 0 + 16t2 + -16t2
85 + -175t + -16t2 = 16t2 + -16t2

Combine like terms: 16t2 + -16t2 = 0
85 + -175t + -16t2 = 0

Begin completing the square.  Divide all terms by
-16 the coefficient of the squared term: 

Divide each side by '-16'.
-5.3125 + 10.9375t + t2 = 0

Move the constant term to the right:

Add '5.3125' to each side of the equation.
-5.3125 + 10.9375t + 5.3125 + t2 = 0 + 5.3125

Reorder the terms:
-5.3125 + 5.3125 + 10.9375t + t2 = 0 + 5.3125

Combine like terms: -5.3125 + 5.3125 = 0.0000
0.0000 + 10.9375t + t2 = 0 + 5.3125
10.9375t + t2 = 0 + 5.3125

Combine like terms: 0 + 5.3125 = 5.3125
10.9375t + t2 = 5.3125

The t term is 10.9375t.  Take half its coefficient (5.46875).
Square it (29.90722656) and add it to both sides.

Add '29.90722656' to each side of the equation.
10.9375t + 29.90722656 + t2 = 5.3125 + 29.90722656

Reorder the terms:
29.90722656 + 10.9375t + t2 = 5.3125 + 29.90722656

Combine like terms: 5.3125 + 29.90722656 = 35.21972656
29.90722656 + 10.9375t + t2 = 35.21972656

Factor a perfect square on the left side:
(t + 5.46875)(t + 5.46875) = 35.21972656

Calculate the square root of the right side: 5.934621012

Break this problem into two subproblems by setting 
(t + 5.46875) equal to 5.934621012 and -5.934621012.

Subproblem 1

t + 5.46875 = 5.934621012 Simplifying t + 5.46875 = 5.934621012 Reorder the terms: 5.46875 + t = 5.934621012 Solving 5.46875 + t = 5.934621012 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-5.46875' to each side of the equation. 5.46875 + -5.46875 + t = 5.934621012 + -5.46875 Combine like terms: 5.46875 + -5.46875 = 0.00000 0.00000 + t = 5.934621012 + -5.46875 t = 5.934621012 + -5.46875 Combine like terms: 5.934621012 + -5.46875 = 0.465871012 t = 0.465871012 Simplifying t = 0.465871012

Subproblem 2

t + 5.46875 = -5.934621012 Simplifying t + 5.46875 = -5.934621012 Reorder the terms: 5.46875 + t = -5.934621012 Solving 5.46875 + t = -5.934621012 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-5.46875' to each side of the equation. 5.46875 + -5.46875 + t = -5.934621012 + -5.46875 Combine like terms: 5.46875 + -5.46875 = 0.00000 0.00000 + t = -5.934621012 + -5.46875 t = -5.934621012 + -5.46875 Combine like terms: -5.934621012 + -5.46875 = -11.403371012 t = -11.403371012 Simplifying t = -11.403371012

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.465871012, -11.403371012}

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