-150=90t-(0.5*9.81*t^2)

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Solution for -150=90t-(0.5*9.81*t^2) equation:


Simplifying
-150 = 90t + -1(0.5 * 9.81t2)

Multiply 0.5 * 9.81
-150 = 90t + -1(4.905t2)

Remove parenthesis around (4.905t2)
-150 = 90t + -1 * 4.905t2

Multiply -1 * 4.905
-150 = 90t + -4.905t2

Solving
-150 = 90t + -4.905t2

Solving for variable 't'.

Reorder the terms:
-150 + -90t + 4.905t2 = 90t + -90t + -4.905t2 + 4.905t2

Combine like terms: 90t + -90t = 0
-150 + -90t + 4.905t2 = 0 + -4.905t2 + 4.905t2
-150 + -90t + 4.905t2 = -4.905t2 + 4.905t2

Combine like terms: -4.905t2 + 4.905t2 = 0.000
-150 + -90t + 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'.
-30.58103976 + -18.34862385t + t2 = 0

Move the constant term to the right:

Add '30.58103976' to each side of the equation.
-30.58103976 + -18.34862385t + 30.58103976 + t2 = 0 + 30.58103976

Reorder the terms:
-30.58103976 + 30.58103976 + -18.34862385t + t2 = 0 + 30.58103976

Combine like terms: -30.58103976 + 30.58103976 = 0.00000000
0.00000000 + -18.34862385t + t2 = 0 + 30.58103976
-18.34862385t + t2 = 0 + 30.58103976

Combine like terms: 0 + 30.58103976 = 30.58103976
-18.34862385t + t2 = 30.58103976

The t term is -18.34862385t.  Take half its coefficient (-9.174311925).
Square it (84.16799930) and add it to both sides.

Add '84.16799930' to each side of the equation.
-18.34862385t + 84.16799930 + t2 = 30.58103976 + 84.16799930

Reorder the terms:
84.16799930 + -18.34862385t + t2 = 30.58103976 + 84.16799930

Combine like terms: 30.58103976 + 84.16799930 = 114.74903906
84.16799930 + -18.34862385t + t2 = 114.74903906

Factor a perfect square on the left side:
(t + -9.174311925)(t + -9.174311925) = 114.74903906

Calculate the square root of the right side: 10.71209779

Break this problem into two subproblems by setting 
(t + -9.174311925) equal to 10.71209779 and -10.71209779.

Subproblem 1

t + -9.174311925 = 10.71209779 Simplifying t + -9.174311925 = 10.71209779 Reorder the terms: -9.174311925 + t = 10.71209779 Solving -9.174311925 + t = 10.71209779 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '9.174311925' to each side of the equation. -9.174311925 + 9.174311925 + t = 10.71209779 + 9.174311925 Combine like terms: -9.174311925 + 9.174311925 = 0.000000000 0.000000000 + t = 10.71209779 + 9.174311925 t = 10.71209779 + 9.174311925 Combine like terms: 10.71209779 + 9.174311925 = 19.886409715 t = 19.886409715 Simplifying t = 19.886409715

Subproblem 2

t + -9.174311925 = -10.71209779 Simplifying t + -9.174311925 = -10.71209779 Reorder the terms: -9.174311925 + t = -10.71209779 Solving -9.174311925 + t = -10.71209779 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '9.174311925' to each side of the equation. -9.174311925 + 9.174311925 + t = -10.71209779 + 9.174311925 Combine like terms: -9.174311925 + 9.174311925 = 0.000000000 0.000000000 + t = -10.71209779 + 9.174311925 t = -10.71209779 + 9.174311925 Combine like terms: -10.71209779 + 9.174311925 = -1.537785865 t = -1.537785865 Simplifying t = -1.537785865

Solution

The solution to the problem is based on the solutions from the subproblems. t = {19.886409715, -1.537785865}

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