150=90t-4.9t^2

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Solution for 150=90t-4.9t^2 equation:


Simplifying
150 = 90t + -4.9t2

Solving
150 = 90t + -4.9t2

Solving for variable 't'.

Reorder the terms:
150 + -90t + 4.9t2 = 90t + -90t + -4.9t2 + 4.9t2

Combine like terms: 90t + -90t = 0
150 + -90t + 4.9t2 = 0 + -4.9t2 + 4.9t2
150 + -90t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
150 + -90t + 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'.
30.6122449 + -18.36734694t + t2 = 0

Move the constant term to the right:

Add '-30.6122449' to each side of the equation.
30.6122449 + -18.36734694t + -30.6122449 + t2 = 0 + -30.6122449

Reorder the terms:
30.6122449 + -30.6122449 + -18.36734694t + t2 = 0 + -30.6122449

Combine like terms: 30.6122449 + -30.6122449 = 0.0000000
0.0000000 + -18.36734694t + t2 = 0 + -30.6122449
-18.36734694t + t2 = 0 + -30.6122449

Combine like terms: 0 + -30.6122449 = -30.6122449
-18.36734694t + t2 = -30.6122449

The t term is -18.36734694t.  Take half its coefficient (-9.18367347).
Square it (84.33985840) and add it to both sides.

Add '84.33985840' to each side of the equation.
-18.36734694t + 84.33985840 + t2 = -30.6122449 + 84.33985840

Reorder the terms:
84.33985840 + -18.36734694t + t2 = -30.6122449 + 84.33985840

Combine like terms: -30.6122449 + 84.33985840 = 53.7276135
84.33985840 + -18.36734694t + t2 = 53.7276135

Factor a perfect square on the left side:
(t + -9.18367347)(t + -9.18367347) = 53.7276135

Calculate the square root of the right side: 7.329912244

Break this problem into two subproblems by setting 
(t + -9.18367347) equal to 7.329912244 and -7.329912244.

Subproblem 1

t + -9.18367347 = 7.329912244 Simplifying t + -9.18367347 = 7.329912244 Reorder the terms: -9.18367347 + t = 7.329912244 Solving -9.18367347 + t = 7.329912244 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '9.18367347' to each side of the equation. -9.18367347 + 9.18367347 + t = 7.329912244 + 9.18367347 Combine like terms: -9.18367347 + 9.18367347 = 0.00000000 0.00000000 + t = 7.329912244 + 9.18367347 t = 7.329912244 + 9.18367347 Combine like terms: 7.329912244 + 9.18367347 = 16.513585714 t = 16.513585714 Simplifying t = 16.513585714

Subproblem 2

t + -9.18367347 = -7.329912244 Simplifying t + -9.18367347 = -7.329912244 Reorder the terms: -9.18367347 + t = -7.329912244 Solving -9.18367347 + t = -7.329912244 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '9.18367347' to each side of the equation. -9.18367347 + 9.18367347 + t = -7.329912244 + 9.18367347 Combine like terms: -9.18367347 + 9.18367347 = 0.00000000 0.00000000 + t = -7.329912244 + 9.18367347 t = -7.329912244 + 9.18367347 Combine like terms: -7.329912244 + 9.18367347 = 1.853761226 t = 1.853761226 Simplifying t = 1.853761226

Solution

The solution to the problem is based on the solutions from the subproblems. t = {16.513585714, 1.853761226}

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