25x=4x^2-9

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Solution for 25x=4x^2-9 equation:


Simplifying
25x = 4x2 + -9

Reorder the terms:
25x = -9 + 4x2

Solving
25x = -9 + 4x2

Solving for variable 'x'.

Reorder the terms:
9 + 25x + -4x2 = -9 + 4x2 + 9 + -4x2

Reorder the terms:
9 + 25x + -4x2 = -9 + 9 + 4x2 + -4x2

Combine like terms: -9 + 9 = 0
9 + 25x + -4x2 = 0 + 4x2 + -4x2
9 + 25x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
9 + 25x + -4x2 = 0

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

Divide each side by '-4'.
-2.25 + -6.25x + x2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + -6.25x + 2.25 + x2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + -6.25x + x2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + -6.25x + x2 = 0 + 2.25
-6.25x + x2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
-6.25x + x2 = 2.25

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 = 2.25 + 9.765625

Reorder the terms:
9.765625 + -6.25x + x2 = 2.25 + 9.765625

Combine like terms: 2.25 + 9.765625 = 12.015625
9.765625 + -6.25x + x2 = 12.015625

Factor a perfect square on the left side:
(x + -3.125)(x + -3.125) = 12.015625

Calculate the square root of the right side: 3.466356156

Break this problem into two subproblems by setting 
(x + -3.125) equal to 3.466356156 and -3.466356156.

Subproblem 1

x + -3.125 = 3.466356156 Simplifying x + -3.125 = 3.466356156 Reorder the terms: -3.125 + x = 3.466356156 Solving -3.125 + x = 3.466356156 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 = 3.466356156 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + x = 3.466356156 + 3.125 x = 3.466356156 + 3.125 Combine like terms: 3.466356156 + 3.125 = 6.591356156 x = 6.591356156 Simplifying x = 6.591356156

Subproblem 2

x + -3.125 = -3.466356156 Simplifying x + -3.125 = -3.466356156 Reorder the terms: -3.125 + x = -3.466356156 Solving -3.125 + x = -3.466356156 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 = -3.466356156 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + x = -3.466356156 + 3.125 x = -3.466356156 + 3.125 Combine like terms: -3.466356156 + 3.125 = -0.341356156 x = -0.341356156 Simplifying x = -0.341356156

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.591356156, -0.341356156}

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