60=3.5t-.05(t*t)

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Solution for 60=3.5t-.05(t*t) equation:


Simplifying
60 = 3.5t + -0.05(t * t)

Multiply t * t
60 = 3.5t + -0.05(t2)

Solving
60 = 3.5t + -0.05t2

Solving for variable 't'.

Reorder the terms:
60 + -3.5t + 0.05t2 = 3.5t + -3.5t + -0.05t2 + 0.05t2

Combine like terms: 3.5t + -3.5t = 0.0
60 + -3.5t + 0.05t2 = 0.0 + -0.05t2 + 0.05t2
60 + -3.5t + 0.05t2 = -0.05t2 + 0.05t2

Combine like terms: -0.05t2 + 0.05t2 = 0.00
60 + -3.5t + 0.05t2 = 0.00

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

Divide each side by '0.05'.
1200 + -70t + t2 = 0

Move the constant term to the right:

Add '-1200' to each side of the equation.
1200 + -70t + -1200 + t2 = 0 + -1200

Reorder the terms:
1200 + -1200 + -70t + t2 = 0 + -1200

Combine like terms: 1200 + -1200 = 0
0 + -70t + t2 = 0 + -1200
-70t + t2 = 0 + -1200

Combine like terms: 0 + -1200 = -1200
-70t + t2 = -1200

The t term is -70t.  Take half its coefficient (-35).
Square it (1225) and add it to both sides.

Add '1225' to each side of the equation.
-70t + 1225 + t2 = -1200 + 1225

Reorder the terms:
1225 + -70t + t2 = -1200 + 1225

Combine like terms: -1200 + 1225 = 25
1225 + -70t + t2 = 25

Factor a perfect square on the left side:
(t + -35)(t + -35) = 25

Calculate the square root of the right side: 5

Break this problem into two subproblems by setting 
(t + -35) equal to 5 and -5.

Subproblem 1

t + -35 = 5 Simplifying t + -35 = 5 Reorder the terms: -35 + t = 5 Solving -35 + t = 5 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + t = 5 + 35 Combine like terms: -35 + 35 = 0 0 + t = 5 + 35 t = 5 + 35 Combine like terms: 5 + 35 = 40 t = 40 Simplifying t = 40

Subproblem 2

t + -35 = -5 Simplifying t + -35 = -5 Reorder the terms: -35 + t = -5 Solving -35 + t = -5 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + t = -5 + 35 Combine like terms: -35 + 35 = 0 0 + t = -5 + 35 t = -5 + 35 Combine like terms: -5 + 35 = 30 t = 30 Simplifying t = 30

Solution

The solution to the problem is based on the solutions from the subproblems. t = {40, 30}

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