60=-4.9t^2+40t

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Solution for 60=-4.9t^2+40t equation:


Simplifying
60 = -4.9t2 + 40t

Reorder the terms:
60 = 40t + -4.9t2

Solving
60 = 40t + -4.9t2

Solving for variable 't'.

Reorder the terms:
60 + -40t + 4.9t2 = 40t + -40t + -4.9t2 + 4.9t2

Combine like terms: 40t + -40t = 0
60 + -40t + 4.9t2 = 0 + -4.9t2 + 4.9t2
60 + -40t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
60 + -40t + 4.9t2 = 0.0

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

Divide each side by '4.9'.
12.24489796 + -8.163265306t + t2 = 0

Move the constant term to the right:

Add '-12.24489796' to each side of the equation.
12.24489796 + -8.163265306t + -12.24489796 + t2 = 0 + -12.24489796

Reorder the terms:
12.24489796 + -12.24489796 + -8.163265306t + t2 = 0 + -12.24489796

Combine like terms: 12.24489796 + -12.24489796 = 0.00000000
0.00000000 + -8.163265306t + t2 = 0 + -12.24489796
-8.163265306t + t2 = 0 + -12.24489796

Combine like terms: 0 + -12.24489796 = -12.24489796
-8.163265306t + t2 = -12.24489796

The t term is -8.163265306t.  Take half its coefficient (-4.081632653).
Square it (16.65972511) and add it to both sides.

Add '16.65972511' to each side of the equation.
-8.163265306t + 16.65972511 + t2 = -12.24489796 + 16.65972511

Reorder the terms:
16.65972511 + -8.163265306t + t2 = -12.24489796 + 16.65972511

Combine like terms: -12.24489796 + 16.65972511 = 4.41482715
16.65972511 + -8.163265306t + t2 = 4.41482715

Factor a perfect square on the left side:
(t + -4.081632653)(t + -4.081632653) = 4.41482715

Calculate the square root of the right side: 2.101149007

Break this problem into two subproblems by setting 
(t + -4.081632653) equal to 2.101149007 and -2.101149007.

Subproblem 1

t + -4.081632653 = 2.101149007 Simplifying t + -4.081632653 = 2.101149007 Reorder the terms: -4.081632653 + t = 2.101149007 Solving -4.081632653 + t = 2.101149007 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.081632653' to each side of the equation. -4.081632653 + 4.081632653 + t = 2.101149007 + 4.081632653 Combine like terms: -4.081632653 + 4.081632653 = 0.000000000 0.000000000 + t = 2.101149007 + 4.081632653 t = 2.101149007 + 4.081632653 Combine like terms: 2.101149007 + 4.081632653 = 6.18278166 t = 6.18278166 Simplifying t = 6.18278166

Subproblem 2

t + -4.081632653 = -2.101149007 Simplifying t + -4.081632653 = -2.101149007 Reorder the terms: -4.081632653 + t = -2.101149007 Solving -4.081632653 + t = -2.101149007 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.081632653' to each side of the equation. -4.081632653 + 4.081632653 + t = -2.101149007 + 4.081632653 Combine like terms: -4.081632653 + 4.081632653 = 0.000000000 0.000000000 + t = -2.101149007 + 4.081632653 t = -2.101149007 + 4.081632653 Combine like terms: -2.101149007 + 4.081632653 = 1.980483646 t = 1.980483646 Simplifying t = 1.980483646

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.18278166, 1.980483646}

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