-21.5=10.4t+(-4.905)t^2

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Solution for -21.5=10.4t+(-4.905)t^2 equation:


Simplifying
-21.5 = 10.4t + (-4.905) * t2

Solving
-21.5 = 10.4t + -4.905t2

Solving for variable 't'.

Reorder the terms:
-21.5 + -10.4t + 4.905t2 = 10.4t + -10.4t + -4.905t2 + 4.905t2

Combine like terms: 10.4t + -10.4t = 0.0
-21.5 + -10.4t + 4.905t2 = 0.0 + -4.905t2 + 4.905t2
-21.5 + -10.4t + 4.905t2 = -4.905t2 + 4.905t2

Combine like terms: -4.905t2 + 4.905t2 = 0.000
-21.5 + -10.4t + 4.905t2 = 0.000

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

Divide each side by '4.905'.
-4.383282365 + -2.120285423t + t2 = 0

Move the constant term to the right:

Add '4.383282365' to each side of the equation.
-4.383282365 + -2.120285423t + 4.383282365 + t2 = 0 + 4.383282365

Reorder the terms:
-4.383282365 + 4.383282365 + -2.120285423t + t2 = 0 + 4.383282365

Combine like terms: -4.383282365 + 4.383282365 = 0.000000000
0.000000000 + -2.120285423t + t2 = 0 + 4.383282365
-2.120285423t + t2 = 0 + 4.383282365

Combine like terms: 0 + 4.383282365 = 4.383282365
-2.120285423t + t2 = 4.383282365

The t term is -2.120285423t.  Take half its coefficient (-1.060142712).
Square it (1.123902570) and add it to both sides.

Add '1.123902570' to each side of the equation.
-2.120285423t + 1.123902570 + t2 = 4.383282365 + 1.123902570

Reorder the terms:
1.123902570 + -2.120285423t + t2 = 4.383282365 + 1.123902570

Combine like terms: 4.383282365 + 1.123902570 = 5.507184935
1.123902570 + -2.120285423t + t2 = 5.507184935

Factor a perfect square on the left side:
(t + -1.060142712)(t + -1.060142712) = 5.507184935

Calculate the square root of the right side: 2.346739213

Break this problem into two subproblems by setting 
(t + -1.060142712) equal to 2.346739213 and -2.346739213.

Subproblem 1

t + -1.060142712 = 2.346739213 Simplifying t + -1.060142712 = 2.346739213 Reorder the terms: -1.060142712 + t = 2.346739213 Solving -1.060142712 + t = 2.346739213 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.060142712' to each side of the equation. -1.060142712 + 1.060142712 + t = 2.346739213 + 1.060142712 Combine like terms: -1.060142712 + 1.060142712 = 0.000000000 0.000000000 + t = 2.346739213 + 1.060142712 t = 2.346739213 + 1.060142712 Combine like terms: 2.346739213 + 1.060142712 = 3.406881925 t = 3.406881925 Simplifying t = 3.406881925

Subproblem 2

t + -1.060142712 = -2.346739213 Simplifying t + -1.060142712 = -2.346739213 Reorder the terms: -1.060142712 + t = -2.346739213 Solving -1.060142712 + t = -2.346739213 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.060142712' to each side of the equation. -1.060142712 + 1.060142712 + t = -2.346739213 + 1.060142712 Combine like terms: -1.060142712 + 1.060142712 = 0.000000000 0.000000000 + t = -2.346739213 + 1.060142712 t = -2.346739213 + 1.060142712 Combine like terms: -2.346739213 + 1.060142712 = -1.286596501 t = -1.286596501 Simplifying t = -1.286596501

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.406881925, -1.286596501}

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