34=0.05x^2+16.9x

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Solution for 34=0.05x^2+16.9x equation:


Simplifying
34 = 0.05x2 + 16.9x

Reorder the terms:
34 = 16.9x + 0.05x2

Solving
34 = 16.9x + 0.05x2

Solving for variable 'x'.

Reorder the terms:
34 + -16.9x + -0.05x2 = 16.9x + -16.9x + 0.05x2 + -0.05x2

Combine like terms: 16.9x + -16.9x = 0.0
34 + -16.9x + -0.05x2 = 0.0 + 0.05x2 + -0.05x2
34 + -16.9x + -0.05x2 = 0.05x2 + -0.05x2

Combine like terms: 0.05x2 + -0.05x2 = 0.00
34 + -16.9x + -0.05x2 = 0.00

Begin completing the square.  Divide all terms by
-0.05 the coefficient of the squared term: 

Divide each side by '-0.05'.
-680 + 338x + x2 = 0

Move the constant term to the right:

Add '680' to each side of the equation.
-680 + 338x + 680 + x2 = 0 + 680

Reorder the terms:
-680 + 680 + 338x + x2 = 0 + 680

Combine like terms: -680 + 680 = 0
0 + 338x + x2 = 0 + 680
338x + x2 = 0 + 680

Combine like terms: 0 + 680 = 680
338x + x2 = 680

The x term is 338x.  Take half its coefficient (169).
Square it (28561) and add it to both sides.

Add '28561' to each side of the equation.
338x + 28561 + x2 = 680 + 28561

Reorder the terms:
28561 + 338x + x2 = 680 + 28561

Combine like terms: 680 + 28561 = 29241
28561 + 338x + x2 = 29241

Factor a perfect square on the left side:
(x + 169)(x + 169) = 29241

Calculate the square root of the right side: 171

Break this problem into two subproblems by setting 
(x + 169) equal to 171 and -171.

Subproblem 1

x + 169 = 171 Simplifying x + 169 = 171 Reorder the terms: 169 + x = 171 Solving 169 + x = 171 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-169' to each side of the equation. 169 + -169 + x = 171 + -169 Combine like terms: 169 + -169 = 0 0 + x = 171 + -169 x = 171 + -169 Combine like terms: 171 + -169 = 2 x = 2 Simplifying x = 2

Subproblem 2

x + 169 = -171 Simplifying x + 169 = -171 Reorder the terms: 169 + x = -171 Solving 169 + x = -171 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-169' to each side of the equation. 169 + -169 + x = -171 + -169 Combine like terms: 169 + -169 = 0 0 + x = -171 + -169 x = -171 + -169 Combine like terms: -171 + -169 = -340 x = -340 Simplifying x = -340

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2, -340}

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