x=(x+30)(5x-25)

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Solution for x=(x+30)(5x-25) equation:


Simplifying
x = (x + 30)(5x + -25)

Reorder the terms:
x = (30 + x)(5x + -25)

Reorder the terms:
x = (30 + x)(-25 + 5x)

Multiply (30 + x) * (-25 + 5x)
x = (30(-25 + 5x) + x(-25 + 5x))
x = ((-25 * 30 + 5x * 30) + x(-25 + 5x))
x = ((-750 + 150x) + x(-25 + 5x))
x = (-750 + 150x + (-25 * x + 5x * x))
x = (-750 + 150x + (-25x + 5x2))

Combine like terms: 150x + -25x = 125x
x = (-750 + 125x + 5x2)

Solving
x = -750 + 125x + 5x2

Solving for variable 'x'.

Reorder the terms:
750 + x + -125x + -5x2 = -750 + 125x + 5x2 + 750 + -125x + -5x2

Combine like terms: x + -125x = -124x
750 + -124x + -5x2 = -750 + 125x + 5x2 + 750 + -125x + -5x2

Reorder the terms:
750 + -124x + -5x2 = -750 + 750 + 125x + -125x + 5x2 + -5x2

Combine like terms: -750 + 750 = 0
750 + -124x + -5x2 = 0 + 125x + -125x + 5x2 + -5x2
750 + -124x + -5x2 = 125x + -125x + 5x2 + -5x2

Combine like terms: 125x + -125x = 0
750 + -124x + -5x2 = 0 + 5x2 + -5x2
750 + -124x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
750 + -124x + -5x2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-150 + 24.8x + x2 = 0

Move the constant term to the right:

Add '150' to each side of the equation.
-150 + 24.8x + 150 + x2 = 0 + 150

Reorder the terms:
-150 + 150 + 24.8x + x2 = 0 + 150

Combine like terms: -150 + 150 = 0
0 + 24.8x + x2 = 0 + 150
24.8x + x2 = 0 + 150

Combine like terms: 0 + 150 = 150
24.8x + x2 = 150

The x term is 24.8x.  Take half its coefficient (12.4).
Square it (153.76) and add it to both sides.

Add '153.76' to each side of the equation.
24.8x + 153.76 + x2 = 150 + 153.76

Reorder the terms:
153.76 + 24.8x + x2 = 150 + 153.76

Combine like terms: 150 + 153.76 = 303.76
153.76 + 24.8x + x2 = 303.76

Factor a perfect square on the left side:
(x + 12.4)(x + 12.4) = 303.76

Calculate the square root of the right side: 17.428711943

Break this problem into two subproblems by setting 
(x + 12.4) equal to 17.428711943 and -17.428711943.

Subproblem 1

x + 12.4 = 17.428711943 Simplifying x + 12.4 = 17.428711943 Reorder the terms: 12.4 + x = 17.428711943 Solving 12.4 + x = 17.428711943 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.4' to each side of the equation. 12.4 + -12.4 + x = 17.428711943 + -12.4 Combine like terms: 12.4 + -12.4 = 0.0 0.0 + x = 17.428711943 + -12.4 x = 17.428711943 + -12.4 Combine like terms: 17.428711943 + -12.4 = 5.028711943 x = 5.028711943 Simplifying x = 5.028711943

Subproblem 2

x + 12.4 = -17.428711943 Simplifying x + 12.4 = -17.428711943 Reorder the terms: 12.4 + x = -17.428711943 Solving 12.4 + x = -17.428711943 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.4' to each side of the equation. 12.4 + -12.4 + x = -17.428711943 + -12.4 Combine like terms: 12.4 + -12.4 = 0.0 0.0 + x = -17.428711943 + -12.4 x = -17.428711943 + -12.4 Combine like terms: -17.428711943 + -12.4 = -29.828711943 x = -29.828711943 Simplifying x = -29.828711943

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.028711943, -29.828711943}

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