240=390-5t^2+2t

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Solution for 240=390-5t^2+2t equation:


Simplifying
240 = 390 + -5t2 + 2t

Reorder the terms:
240 = 390 + 2t + -5t2

Solving
240 = 390 + 2t + -5t2

Solving for variable 't'.

Combine like terms: 240 + -390 = -150
-150 + -2t + 5t2 = 390 + 2t + -5t2 + -390 + -2t + 5t2

Reorder the terms:
-150 + -2t + 5t2 = 390 + -390 + 2t + -2t + -5t2 + 5t2

Combine like terms: 390 + -390 = 0
-150 + -2t + 5t2 = 0 + 2t + -2t + -5t2 + 5t2
-150 + -2t + 5t2 = 2t + -2t + -5t2 + 5t2

Combine like terms: 2t + -2t = 0
-150 + -2t + 5t2 = 0 + -5t2 + 5t2
-150 + -2t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
-150 + -2t + 5t2 = 0

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

Divide each side by '5'.
-30 + -0.4t + t2 = 0

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + -0.4t + 30 + t2 = 0 + 30

Reorder the terms:
-30 + 30 + -0.4t + t2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -0.4t + t2 = 0 + 30
-0.4t + t2 = 0 + 30

Combine like terms: 0 + 30 = 30
-0.4t + t2 = 30

The t term is -0.4t.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4t + 0.04 + t2 = 30 + 0.04

Reorder the terms:
0.04 + -0.4t + t2 = 30 + 0.04

Combine like terms: 30 + 0.04 = 30.04
0.04 + -0.4t + t2 = 30.04

Factor a perfect square on the left side:
(t + -0.2)(t + -0.2) = 30.04

Calculate the square root of the right side: 5.480875842

Break this problem into two subproblems by setting 
(t + -0.2) equal to 5.480875842 and -5.480875842.

Subproblem 1

t + -0.2 = 5.480875842 Simplifying t + -0.2 = 5.480875842 Reorder the terms: -0.2 + t = 5.480875842 Solving -0.2 + t = 5.480875842 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + t = 5.480875842 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + t = 5.480875842 + 0.2 t = 5.480875842 + 0.2 Combine like terms: 5.480875842 + 0.2 = 5.680875842 t = 5.680875842 Simplifying t = 5.680875842

Subproblem 2

t + -0.2 = -5.480875842 Simplifying t + -0.2 = -5.480875842 Reorder the terms: -0.2 + t = -5.480875842 Solving -0.2 + t = -5.480875842 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + t = -5.480875842 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + t = -5.480875842 + 0.2 t = -5.480875842 + 0.2 Combine like terms: -5.480875842 + 0.2 = -5.280875842 t = -5.280875842 Simplifying t = -5.280875842

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.680875842, -5.280875842}

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