170=-4.5t+4.9t^2

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Solution for 170=-4.5t+4.9t^2 equation:


Simplifying
170 = -4.5t + 4.9t2

Solving
170 = -4.5t + 4.9t2

Solving for variable 't'.

Reorder the terms:
170 + 4.5t + -4.9t2 = -4.5t + 4.5t + 4.9t2 + -4.9t2

Combine like terms: -4.5t + 4.5t = 0.0
170 + 4.5t + -4.9t2 = 0.0 + 4.9t2 + -4.9t2
170 + 4.5t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
170 + 4.5t + -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'.
-34.69387755 + -0.9183673469t + t2 = 0

Move the constant term to the right:

Add '34.69387755' to each side of the equation.
-34.69387755 + -0.9183673469t + 34.69387755 + t2 = 0 + 34.69387755

Reorder the terms:
-34.69387755 + 34.69387755 + -0.9183673469t + t2 = 0 + 34.69387755

Combine like terms: -34.69387755 + 34.69387755 = 0.00000000
0.00000000 + -0.9183673469t + t2 = 0 + 34.69387755
-0.9183673469t + t2 = 0 + 34.69387755

Combine like terms: 0 + 34.69387755 = 34.69387755
-0.9183673469t + t2 = 34.69387755

The t term is -0.9183673469t.  Take half its coefficient (-0.4591836735).
Square it (0.2108496460) and add it to both sides.

Add '0.2108496460' to each side of the equation.
-0.9183673469t + 0.2108496460 + t2 = 34.69387755 + 0.2108496460

Reorder the terms:
0.2108496460 + -0.9183673469t + t2 = 34.69387755 + 0.2108496460

Combine like terms: 34.69387755 + 0.2108496460 = 34.904727196
0.2108496460 + -0.9183673469t + t2 = 34.904727196

Factor a perfect square on the left side:
(t + -0.4591836735)(t + -0.4591836735) = 34.904727196

Calculate the square root of the right side: 5.908022275

Break this problem into two subproblems by setting 
(t + -0.4591836735) equal to 5.908022275 and -5.908022275.

Subproblem 1

t + -0.4591836735 = 5.908022275 Simplifying t + -0.4591836735 = 5.908022275 Reorder the terms: -0.4591836735 + t = 5.908022275 Solving -0.4591836735 + t = 5.908022275 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.4591836735' to each side of the equation. -0.4591836735 + 0.4591836735 + t = 5.908022275 + 0.4591836735 Combine like terms: -0.4591836735 + 0.4591836735 = 0.0000000000 0.0000000000 + t = 5.908022275 + 0.4591836735 t = 5.908022275 + 0.4591836735 Combine like terms: 5.908022275 + 0.4591836735 = 6.3672059485 t = 6.3672059485 Simplifying t = 6.3672059485

Subproblem 2

t + -0.4591836735 = -5.908022275 Simplifying t + -0.4591836735 = -5.908022275 Reorder the terms: -0.4591836735 + t = -5.908022275 Solving -0.4591836735 + t = -5.908022275 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.4591836735' to each side of the equation. -0.4591836735 + 0.4591836735 + t = -5.908022275 + 0.4591836735 Combine like terms: -0.4591836735 + 0.4591836735 = 0.0000000000 0.0000000000 + t = -5.908022275 + 0.4591836735 t = -5.908022275 + 0.4591836735 Combine like terms: -5.908022275 + 0.4591836735 = -5.4488386015 t = -5.4488386015 Simplifying t = -5.4488386015

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.3672059485, -5.4488386015}

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