4x(x-3)+5x=48

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Solution for 4x(x-3)+5x=48 equation:


Simplifying
4x(x + -3) + 5x = 48

Reorder the terms:
4x(-3 + x) + 5x = 48
(-3 * 4x + x * 4x) + 5x = 48
(-12x + 4x2) + 5x = 48

Reorder the terms:
-12x + 5x + 4x2 = 48

Combine like terms: -12x + 5x = -7x
-7x + 4x2 = 48

Solving
-7x + 4x2 = 48

Solving for variable 'x'.

Reorder the terms:
-48 + -7x + 4x2 = 48 + -48

Combine like terms: 48 + -48 = 0
-48 + -7x + 4x2 = 0

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

Divide each side by '4'.
-12 + -1.75x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -1.75x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -1.75x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -1.75x + x2 = 0 + 12
-1.75x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-1.75x + x2 = 12

The x term is -1.75x.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75x + 0.765625 + x2 = 12 + 0.765625

Reorder the terms:
0.765625 + -1.75x + x2 = 12 + 0.765625

Combine like terms: 12 + 0.765625 = 12.765625
0.765625 + -1.75x + x2 = 12.765625

Factor a perfect square on the left side:
(x + -0.875)(x + -0.875) = 12.765625

Calculate the square root of the right side: 3.572901482

Break this problem into two subproblems by setting 
(x + -0.875) equal to 3.572901482 and -3.572901482.

Subproblem 1

x + -0.875 = 3.572901482 Simplifying x + -0.875 = 3.572901482 Reorder the terms: -0.875 + x = 3.572901482 Solving -0.875 + x = 3.572901482 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = 3.572901482 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = 3.572901482 + 0.875 x = 3.572901482 + 0.875 Combine like terms: 3.572901482 + 0.875 = 4.447901482 x = 4.447901482 Simplifying x = 4.447901482

Subproblem 2

x + -0.875 = -3.572901482 Simplifying x + -0.875 = -3.572901482 Reorder the terms: -0.875 + x = -3.572901482 Solving -0.875 + x = -3.572901482 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = -3.572901482 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = -3.572901482 + 0.875 x = -3.572901482 + 0.875 Combine like terms: -3.572901482 + 0.875 = -2.697901482 x = -2.697901482 Simplifying x = -2.697901482

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.447901482, -2.697901482}

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