40x+16x^2=555

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Solution for 40x+16x^2=555 equation:


Simplifying
40x + 16x2 = 555

Solving
40x + 16x2 = 555

Solving for variable 'x'.

Reorder the terms:
-555 + 40x + 16x2 = 555 + -555

Combine like terms: 555 + -555 = 0
-555 + 40x + 16x2 = 0

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

Divide each side by '16'.
-34.6875 + 2.5x + x2 = 0

Move the constant term to the right:

Add '34.6875' to each side of the equation.
-34.6875 + 2.5x + 34.6875 + x2 = 0 + 34.6875

Reorder the terms:
-34.6875 + 34.6875 + 2.5x + x2 = 0 + 34.6875

Combine like terms: -34.6875 + 34.6875 = 0.0000
0.0000 + 2.5x + x2 = 0 + 34.6875
2.5x + x2 = 0 + 34.6875

Combine like terms: 0 + 34.6875 = 34.6875
2.5x + x2 = 34.6875

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 34.6875 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 34.6875 + 1.5625

Combine like terms: 34.6875 + 1.5625 = 36.25
1.5625 + 2.5x + x2 = 36.25

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 36.25

Calculate the square root of the right side: 6.020797289

Break this problem into two subproblems by setting 
(x + 1.25) equal to 6.020797289 and -6.020797289.

Subproblem 1

x + 1.25 = 6.020797289 Simplifying x + 1.25 = 6.020797289 Reorder the terms: 1.25 + x = 6.020797289 Solving 1.25 + x = 6.020797289 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 6.020797289 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 6.020797289 + -1.25 x = 6.020797289 + -1.25 Combine like terms: 6.020797289 + -1.25 = 4.770797289 x = 4.770797289 Simplifying x = 4.770797289

Subproblem 2

x + 1.25 = -6.020797289 Simplifying x + 1.25 = -6.020797289 Reorder the terms: 1.25 + x = -6.020797289 Solving 1.25 + x = -6.020797289 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -6.020797289 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -6.020797289 + -1.25 x = -6.020797289 + -1.25 Combine like terms: -6.020797289 + -1.25 = -7.270797289 x = -7.270797289 Simplifying x = -7.270797289

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.770797289, -7.270797289}

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