73.5=9.8t+4.9t^2

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Solution for 73.5=9.8t+4.9t^2 equation:


Simplifying
73.5 = 9.8t + 4.9t2

Solving
73.5 = 9.8t + 4.9t2

Solving for variable 't'.

Reorder the terms:
73.5 + -9.8t + -4.9t2 = 9.8t + -9.8t + 4.9t2 + -4.9t2

Combine like terms: 9.8t + -9.8t = 0.0
73.5 + -9.8t + -4.9t2 = 0.0 + 4.9t2 + -4.9t2
73.5 + -9.8t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
73.5 + -9.8t + -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'.
-15 + 2t + t2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 2t + 15 + t2 = 0 + 15

Reorder the terms:
-15 + 15 + 2t + t2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 2t + t2 = 0 + 15
2t + t2 = 0 + 15

Combine like terms: 0 + 15 = 15
2t + t2 = 15

The t term is 2t.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2t + 1 + t2 = 15 + 1

Reorder the terms:
1 + 2t + t2 = 15 + 1

Combine like terms: 15 + 1 = 16
1 + 2t + t2 = 16

Factor a perfect square on the left side:
(t + 1)(t + 1) = 16

Calculate the square root of the right side: 4

Break this problem into two subproblems by setting 
(t + 1) equal to 4 and -4.

Subproblem 1

t + 1 = 4 Simplifying t + 1 = 4 Reorder the terms: 1 + t = 4 Solving 1 + t = 4 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + t = 4 + -1 Combine like terms: 1 + -1 = 0 0 + t = 4 + -1 t = 4 + -1 Combine like terms: 4 + -1 = 3 t = 3 Simplifying t = 3

Subproblem 2

t + 1 = -4 Simplifying t + 1 = -4 Reorder the terms: 1 + t = -4 Solving 1 + t = -4 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + t = -4 + -1 Combine like terms: 1 + -1 = 0 0 + t = -4 + -1 t = -4 + -1 Combine like terms: -4 + -1 = -5 t = -5 Simplifying t = -5

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3, -5}

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