50x-6.25x*x=99

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Solution for 50x-6.25x*x=99 equation:


Simplifying
50x + -6.25x * x = 99

Multiply x * x
50x + -6.25x2 = 99

Solving
50x + -6.25x2 = 99

Solving for variable 'x'.

Reorder the terms:
-99 + 50x + -6.25x2 = 99 + -99

Combine like terms: 99 + -99 = 0
-99 + 50x + -6.25x2 = 0

Begin completing the square.  Divide all terms by
-6.25 the coefficient of the squared term: 

Divide each side by '-6.25'.
15.84 + -8x + x2 = 0

Move the constant term to the right:

Add '-15.84' to each side of the equation.
15.84 + -8x + -15.84 + x2 = 0 + -15.84

Reorder the terms:
15.84 + -15.84 + -8x + x2 = 0 + -15.84

Combine like terms: 15.84 + -15.84 = 0.00
0.00 + -8x + x2 = 0 + -15.84
-8x + x2 = 0 + -15.84

Combine like terms: 0 + -15.84 = -15.84
-8x + x2 = -15.84

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -15.84 + 16

Reorder the terms:
16 + -8x + x2 = -15.84 + 16

Combine like terms: -15.84 + 16 = 0.16
16 + -8x + x2 = 0.16

Factor a perfect square on the left side:
(x + -4)(x + -4) = 0.16

Calculate the square root of the right side: 0.4

Break this problem into two subproblems by setting 
(x + -4) equal to 0.4 and -0.4.

Subproblem 1

x + -4 = 0.4 Simplifying x + -4 = 0.4 Reorder the terms: -4 + x = 0.4 Solving -4 + x = 0.4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 0.4 + 4 Combine like terms: -4 + 4 = 0 0 + x = 0.4 + 4 x = 0.4 + 4 Combine like terms: 0.4 + 4 = 4.4 x = 4.4 Simplifying x = 4.4

Subproblem 2

x + -4 = -0.4 Simplifying x + -4 = -0.4 Reorder the terms: -4 + x = -0.4 Solving -4 + x = -0.4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -0.4 + 4 Combine like terms: -4 + 4 = 0 0 + x = -0.4 + 4 x = -0.4 + 4 Combine like terms: -0.4 + 4 = 3.6 x = 3.6 Simplifying x = 3.6

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.4, 3.6}

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