1285=0.08x^2+51x

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Solution for 1285=0.08x^2+51x equation:


Simplifying
1285 = 0.08x2 + 51x

Reorder the terms:
1285 = 51x + 0.08x2

Solving
1285 = 51x + 0.08x2

Solving for variable 'x'.

Reorder the terms:
1285 + -51x + -0.08x2 = 51x + -51x + 0.08x2 + -0.08x2

Combine like terms: 51x + -51x = 0
1285 + -51x + -0.08x2 = 0 + 0.08x2 + -0.08x2
1285 + -51x + -0.08x2 = 0.08x2 + -0.08x2

Combine like terms: 0.08x2 + -0.08x2 = 0.00
1285 + -51x + -0.08x2 = 0.00

Begin completing the square.  Divide all terms by
-0.08 the coefficient of the squared term: 

Divide each side by '-0.08'.
-16062.5 + 637.5x + x2 = 0

Move the constant term to the right:

Add '16062.5' to each side of the equation.
-16062.5 + 637.5x + 16062.5 + x2 = 0 + 16062.5

Reorder the terms:
-16062.5 + 16062.5 + 637.5x + x2 = 0 + 16062.5

Combine like terms: -16062.5 + 16062.5 = 0.0
0.0 + 637.5x + x2 = 0 + 16062.5
637.5x + x2 = 0 + 16062.5

Combine like terms: 0 + 16062.5 = 16062.5
637.5x + x2 = 16062.5

The x term is 637.5x.  Take half its coefficient (318.75).
Square it (101601.5625) and add it to both sides.

Add '101601.5625' to each side of the equation.
637.5x + 101601.5625 + x2 = 16062.5 + 101601.5625

Reorder the terms:
101601.5625 + 637.5x + x2 = 16062.5 + 101601.5625

Combine like terms: 16062.5 + 101601.5625 = 117664.0625
101601.5625 + 637.5x + x2 = 117664.0625

Factor a perfect square on the left side:
(x + 318.75)(x + 318.75) = 117664.0625

Calculate the square root of the right side: 343.021956294

Break this problem into two subproblems by setting 
(x + 318.75) equal to 343.021956294 and -343.021956294.

Subproblem 1

x + 318.75 = 343.021956294 Simplifying x + 318.75 = 343.021956294 Reorder the terms: 318.75 + x = 343.021956294 Solving 318.75 + x = 343.021956294 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-318.75' to each side of the equation. 318.75 + -318.75 + x = 343.021956294 + -318.75 Combine like terms: 318.75 + -318.75 = 0.00 0.00 + x = 343.021956294 + -318.75 x = 343.021956294 + -318.75 Combine like terms: 343.021956294 + -318.75 = 24.271956294 x = 24.271956294 Simplifying x = 24.271956294

Subproblem 2

x + 318.75 = -343.021956294 Simplifying x + 318.75 = -343.021956294 Reorder the terms: 318.75 + x = -343.021956294 Solving 318.75 + x = -343.021956294 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-318.75' to each side of the equation. 318.75 + -318.75 + x = -343.021956294 + -318.75 Combine like terms: 318.75 + -318.75 = 0.00 0.00 + x = -343.021956294 + -318.75 x = -343.021956294 + -318.75 Combine like terms: -343.021956294 + -318.75 = -661.771956294 x = -661.771956294 Simplifying x = -661.771956294

Solution

The solution to the problem is based on the solutions from the subproblems. x = {24.271956294, -661.771956294}

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