15=25(X)-4(X^2)

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Solution for 15=25(X)-4(X^2) equation:


Simplifying
15 = 25(X) + -4(X2)

Solving
15 = 25X + -4X2

Solving for variable 'X'.

Reorder the terms:
15 + -25X + 4X2 = 25X + -25X + -4X2 + 4X2

Combine like terms: 25X + -25X = 0
15 + -25X + 4X2 = 0 + -4X2 + 4X2
15 + -25X + 4X2 = -4X2 + 4X2

Combine like terms: -4X2 + 4X2 = 0
15 + -25X + 4X2 = 0

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

Divide each side by '4'.
3.75 + -6.25X + X2 = 0

Move the constant term to the right:

Add '-3.75' to each side of the equation.
3.75 + -6.25X + -3.75 + X2 = 0 + -3.75

Reorder the terms:
3.75 + -3.75 + -6.25X + X2 = 0 + -3.75

Combine like terms: 3.75 + -3.75 = 0.00
0.00 + -6.25X + X2 = 0 + -3.75
-6.25X + X2 = 0 + -3.75

Combine like terms: 0 + -3.75 = -3.75
-6.25X + X2 = -3.75

The X term is -6.25X.  Take half its coefficient (-3.125).
Square it (9.765625) and add it to both sides.

Add '9.765625' to each side of the equation.
-6.25X + 9.765625 + X2 = -3.75 + 9.765625

Reorder the terms:
9.765625 + -6.25X + X2 = -3.75 + 9.765625

Combine like terms: -3.75 + 9.765625 = 6.015625
9.765625 + -6.25X + X2 = 6.015625

Factor a perfect square on the left side:
(X + -3.125)(X + -3.125) = 6.015625

Calculate the square root of the right side: 2.452677109

Break this problem into two subproblems by setting 
(X + -3.125) equal to 2.452677109 and -2.452677109.

Subproblem 1

X + -3.125 = 2.452677109 Simplifying X + -3.125 = 2.452677109 Reorder the terms: -3.125 + X = 2.452677109 Solving -3.125 + X = 2.452677109 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + X = 2.452677109 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + X = 2.452677109 + 3.125 X = 2.452677109 + 3.125 Combine like terms: 2.452677109 + 3.125 = 5.577677109 X = 5.577677109 Simplifying X = 5.577677109

Subproblem 2

X + -3.125 = -2.452677109 Simplifying X + -3.125 = -2.452677109 Reorder the terms: -3.125 + X = -2.452677109 Solving -3.125 + X = -2.452677109 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + X = -2.452677109 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + X = -2.452677109 + 3.125 X = -2.452677109 + 3.125 Combine like terms: -2.452677109 + 3.125 = 0.672322891 X = 0.672322891 Simplifying X = 0.672322891

Solution

The solution to the problem is based on the solutions from the subproblems. X = {5.577677109, 0.672322891}

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