.5625=(.04x^2+1.5x+.5625)-300

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Solution for .5625=(.04x^2+1.5x+.5625)-300 equation:


Simplifying
0.5625 = (0.04x2 + 1.5x + 0.5625) + -300

Reorder the terms:
0.5625 = (0.5625 + 1.5x + 0.04x2) + -300

Remove parenthesis around (0.5625 + 1.5x + 0.04x2)
0.5625 = 0.5625 + 1.5x + 0.04x2 + -300

Reorder the terms:
0.5625 = 0.5625 + -300 + 1.5x + 0.04x2

Combine like terms: 0.5625 + -300 = -299.4375
0.5625 = -299.4375 + 1.5x + 0.04x2

Solving
0.5625 = -299.4375 + 1.5x + 0.04x2

Solving for variable 'x'.

Combine like terms: 0.5625 + 299.4375 = 300
300 + -1.5x + -0.04x2 = -299.4375 + 1.5x + 0.04x2 + 299.4375 + -1.5x + -0.04x2

Reorder the terms:
300 + -1.5x + -0.04x2 = -299.4375 + 299.4375 + 1.5x + -1.5x + 0.04x2 + -0.04x2

Combine like terms: -299.4375 + 299.4375 = 0.0000
300 + -1.5x + -0.04x2 = 0.0000 + 1.5x + -1.5x + 0.04x2 + -0.04x2
300 + -1.5x + -0.04x2 = 1.5x + -1.5x + 0.04x2 + -0.04x2

Combine like terms: 1.5x + -1.5x = 0.0
300 + -1.5x + -0.04x2 = 0.0 + 0.04x2 + -0.04x2
300 + -1.5x + -0.04x2 = 0.04x2 + -0.04x2

Combine like terms: 0.04x2 + -0.04x2 = 0.00
300 + -1.5x + -0.04x2 = 0.00

Begin completing the square.  Divide all terms by
-0.04 the coefficient of the squared term: 

Divide each side by '-0.04'.
-7500 + 37.5x + x2 = 0

Move the constant term to the right:

Add '7500' to each side of the equation.
-7500 + 37.5x + 7500 + x2 = 0 + 7500

Reorder the terms:
-7500 + 7500 + 37.5x + x2 = 0 + 7500

Combine like terms: -7500 + 7500 = 0
0 + 37.5x + x2 = 0 + 7500
37.5x + x2 = 0 + 7500

Combine like terms: 0 + 7500 = 7500
37.5x + x2 = 7500

The x term is 37.5x.  Take half its coefficient (18.75).
Square it (351.5625) and add it to both sides.

Add '351.5625' to each side of the equation.
37.5x + 351.5625 + x2 = 7500 + 351.5625

Reorder the terms:
351.5625 + 37.5x + x2 = 7500 + 351.5625

Combine like terms: 7500 + 351.5625 = 7851.5625
351.5625 + 37.5x + x2 = 7851.5625

Factor a perfect square on the left side:
(x + 18.75)(x + 18.75) = 7851.5625

Calculate the square root of the right side: 88.609042992

Break this problem into two subproblems by setting 
(x + 18.75) equal to 88.609042992 and -88.609042992.

Subproblem 1

x + 18.75 = 88.609042992 Simplifying x + 18.75 = 88.609042992 Reorder the terms: 18.75 + x = 88.609042992 Solving 18.75 + x = 88.609042992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18.75' to each side of the equation. 18.75 + -18.75 + x = 88.609042992 + -18.75 Combine like terms: 18.75 + -18.75 = 0.00 0.00 + x = 88.609042992 + -18.75 x = 88.609042992 + -18.75 Combine like terms: 88.609042992 + -18.75 = 69.859042992 x = 69.859042992 Simplifying x = 69.859042992

Subproblem 2

x + 18.75 = -88.609042992 Simplifying x + 18.75 = -88.609042992 Reorder the terms: 18.75 + x = -88.609042992 Solving 18.75 + x = -88.609042992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18.75' to each side of the equation. 18.75 + -18.75 + x = -88.609042992 + -18.75 Combine like terms: 18.75 + -18.75 = 0.00 0.00 + x = -88.609042992 + -18.75 x = -88.609042992 + -18.75 Combine like terms: -88.609042992 + -18.75 = -107.359042992 x = -107.359042992 Simplifying x = -107.359042992

Solution

The solution to the problem is based on the solutions from the subproblems. x = {69.859042992, -107.359042992}

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