25x-3x^2=18

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Solution for 25x-3x^2=18 equation:


Simplifying
25x + -3x2 = 18

Solving
25x + -3x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + 25x + -3x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + 25x + -3x2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
6 + -8.333333333x + x2 = 0

Move the constant term to the right:

Add '-6' to each side of the equation.
6 + -8.333333333x + -6 + x2 = 0 + -6

Reorder the terms:
6 + -6 + -8.333333333x + x2 = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -8.333333333x + x2 = 0 + -6
-8.333333333x + x2 = 0 + -6

Combine like terms: 0 + -6 = -6
-8.333333333x + x2 = -6

The x term is -8.333333333x.  Take half its coefficient (-4.166666667).
Square it (17.36111111) and add it to both sides.

Add '17.36111111' to each side of the equation.
-8.333333333x + 17.36111111 + x2 = -6 + 17.36111111

Reorder the terms:
17.36111111 + -8.333333333x + x2 = -6 + 17.36111111

Combine like terms: -6 + 17.36111111 = 11.36111111
17.36111111 + -8.333333333x + x2 = 11.36111111

Factor a perfect square on the left side:
(x + -4.166666667)(x + -4.166666667) = 11.36111111

Calculate the square root of the right side: 3.370624736

Break this problem into two subproblems by setting 
(x + -4.166666667) equal to 3.370624736 and -3.370624736.

Subproblem 1

x + -4.166666667 = 3.370624736 Simplifying x + -4.166666667 = 3.370624736 Reorder the terms: -4.166666667 + x = 3.370624736 Solving -4.166666667 + x = 3.370624736 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.166666667' to each side of the equation. -4.166666667 + 4.166666667 + x = 3.370624736 + 4.166666667 Combine like terms: -4.166666667 + 4.166666667 = 0.000000000 0.000000000 + x = 3.370624736 + 4.166666667 x = 3.370624736 + 4.166666667 Combine like terms: 3.370624736 + 4.166666667 = 7.537291403 x = 7.537291403 Simplifying x = 7.537291403

Subproblem 2

x + -4.166666667 = -3.370624736 Simplifying x + -4.166666667 = -3.370624736 Reorder the terms: -4.166666667 + x = -3.370624736 Solving -4.166666667 + x = -3.370624736 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.166666667' to each side of the equation. -4.166666667 + 4.166666667 + x = -3.370624736 + 4.166666667 Combine like terms: -4.166666667 + 4.166666667 = 0.000000000 0.000000000 + x = -3.370624736 + 4.166666667 x = -3.370624736 + 4.166666667 Combine like terms: -3.370624736 + 4.166666667 = 0.796041931 x = 0.796041931 Simplifying x = 0.796041931

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.537291403, 0.796041931}

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