218.75=35t-.7t^2

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Solution for 218.75=35t-.7t^2 equation:


Simplifying
218.75 = 35t + -0.7t2

Solving
218.75 = 35t + -0.7t2

Solving for variable 't'.

Reorder the terms:
218.75 + -35t + 0.7t2 = 35t + -35t + -0.7t2 + 0.7t2

Combine like terms: 35t + -35t = 0
218.75 + -35t + 0.7t2 = 0 + -0.7t2 + 0.7t2
218.75 + -35t + 0.7t2 = -0.7t2 + 0.7t2

Combine like terms: -0.7t2 + 0.7t2 = 0.0
218.75 + -35t + 0.7t2 = 0.0

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

Divide each side by '0.7'.
312.5 + -50t + t2 = 0

Move the constant term to the right:

Add '-312.5' to each side of the equation.
312.5 + -50t + -312.5 + t2 = 0 + -312.5

Reorder the terms:
312.5 + -312.5 + -50t + t2 = 0 + -312.5

Combine like terms: 312.5 + -312.5 = 0.0
0.0 + -50t + t2 = 0 + -312.5
-50t + t2 = 0 + -312.5

Combine like terms: 0 + -312.5 = -312.5
-50t + t2 = -312.5

The t term is -50t.  Take half its coefficient (-25).
Square it (625) and add it to both sides.

Add '625' to each side of the equation.
-50t + 625 + t2 = -312.5 + 625

Reorder the terms:
625 + -50t + t2 = -312.5 + 625

Combine like terms: -312.5 + 625 = 312.5
625 + -50t + t2 = 312.5

Factor a perfect square on the left side:
(t + -25)(t + -25) = 312.5

Calculate the square root of the right side: 17.67766953

Break this problem into two subproblems by setting 
(t + -25) equal to 17.67766953 and -17.67766953.

Subproblem 1

t + -25 = 17.67766953 Simplifying t + -25 = 17.67766953 Reorder the terms: -25 + t = 17.67766953 Solving -25 + t = 17.67766953 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + t = 17.67766953 + 25 Combine like terms: -25 + 25 = 0 0 + t = 17.67766953 + 25 t = 17.67766953 + 25 Combine like terms: 17.67766953 + 25 = 42.67766953 t = 42.67766953 Simplifying t = 42.67766953

Subproblem 2

t + -25 = -17.67766953 Simplifying t + -25 = -17.67766953 Reorder the terms: -25 + t = -17.67766953 Solving -25 + t = -17.67766953 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + t = -17.67766953 + 25 Combine like terms: -25 + 25 = 0 0 + t = -17.67766953 + 25 t = -17.67766953 + 25 Combine like terms: -17.67766953 + 25 = 7.32233047 t = 7.32233047 Simplifying t = 7.32233047

Solution

The solution to the problem is based on the solutions from the subproblems. t = {42.67766953, 7.32233047}

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