85=-16t^2+175t

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


Simplifying
85 = -16t2 + 175t

Reorder the terms:
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 = 24.59472656
29.90722656 + -10.9375t + t2 = 24.59472656

Factor a perfect square on the left side:
(t + -5.46875)(t + -5.46875) = 24.59472656

Calculate the square root of the right side: 4.959307065

Break this problem into two subproblems by setting 
(t + -5.46875) equal to 4.959307065 and -4.959307065.

Subproblem 1

t + -5.46875 = 4.959307065 Simplifying t + -5.46875 = 4.959307065 Reorder the terms: -5.46875 + t = 4.959307065 Solving -5.46875 + t = 4.959307065 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 = 4.959307065 + 5.46875 Combine like terms: -5.46875 + 5.46875 = 0.00000 0.00000 + t = 4.959307065 + 5.46875 t = 4.959307065 + 5.46875 Combine like terms: 4.959307065 + 5.46875 = 10.428057065 t = 10.428057065 Simplifying t = 10.428057065

Subproblem 2

t + -5.46875 = -4.959307065 Simplifying t + -5.46875 = -4.959307065 Reorder the terms: -5.46875 + t = -4.959307065 Solving -5.46875 + t = -4.959307065 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 = -4.959307065 + 5.46875 Combine like terms: -5.46875 + 5.46875 = 0.00000 0.00000 + t = -4.959307065 + 5.46875 t = -4.959307065 + 5.46875 Combine like terms: -4.959307065 + 5.46875 = 0.509442935 t = 0.509442935 Simplifying t = 0.509442935

Solution

The solution to the problem is based on the solutions from the subproblems. t = {10.428057065, 0.509442935}

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