4x^2-15x=9

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Solution for 4x^2-15x=9 equation:


Simplifying
4x2 + -15x = 9

Reorder the terms:
-15x + 4x2 = 9

Solving
-15x + 4x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + -15x + 4x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -15x + 4x2 = 0

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

Divide each side by '4'.
-2.25 + -3.75x + x2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + -3.75x + 2.25 + x2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + -3.75x + x2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + -3.75x + x2 = 0 + 2.25
-3.75x + x2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
-3.75x + x2 = 2.25

The x term is -3.75x.  Take half its coefficient (-1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
-3.75x + 3.515625 + x2 = 2.25 + 3.515625

Reorder the terms:
3.515625 + -3.75x + x2 = 2.25 + 3.515625

Combine like terms: 2.25 + 3.515625 = 5.765625
3.515625 + -3.75x + x2 = 5.765625

Factor a perfect square on the left side:
(x + -1.875)(x + -1.875) = 5.765625

Calculate the square root of the right side: 2.401171589

Break this problem into two subproblems by setting 
(x + -1.875) equal to 2.401171589 and -2.401171589.

Subproblem 1

x + -1.875 = 2.401171589 Simplifying x + -1.875 = 2.401171589 Reorder the terms: -1.875 + x = 2.401171589 Solving -1.875 + x = 2.401171589 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = 2.401171589 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 2.401171589 + 1.875 x = 2.401171589 + 1.875 Combine like terms: 2.401171589 + 1.875 = 4.276171589 x = 4.276171589 Simplifying x = 4.276171589

Subproblem 2

x + -1.875 = -2.401171589 Simplifying x + -1.875 = -2.401171589 Reorder the terms: -1.875 + x = -2.401171589 Solving -1.875 + x = -2.401171589 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = -2.401171589 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -2.401171589 + 1.875 x = -2.401171589 + 1.875 Combine like terms: -2.401171589 + 1.875 = -0.526171589 x = -0.526171589 Simplifying x = -0.526171589

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.276171589, -0.526171589}

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