(x+7)(x-2)=336

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Solution for (x+7)(x-2)=336 equation:


Simplifying
(x + 7)(x + -2) = 336

Reorder the terms:
(7 + x)(x + -2) = 336

Reorder the terms:
(7 + x)(-2 + x) = 336

Multiply (7 + x) * (-2 + x)
(7(-2 + x) + x(-2 + x)) = 336
((-2 * 7 + x * 7) + x(-2 + x)) = 336
((-14 + 7x) + x(-2 + x)) = 336
(-14 + 7x + (-2 * x + x * x)) = 336
(-14 + 7x + (-2x + x2)) = 336

Combine like terms: 7x + -2x = 5x
(-14 + 5x + x2) = 336

Solving
-14 + 5x + x2 = 336

Solving for variable 'x'.

Reorder the terms:
-14 + -336 + 5x + x2 = 336 + -336

Combine like terms: -14 + -336 = -350
-350 + 5x + x2 = 336 + -336

Combine like terms: 336 + -336 = 0
-350 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '350' to each side of the equation.
-350 + 5x + 350 + x2 = 0 + 350

Reorder the terms:
-350 + 350 + 5x + x2 = 0 + 350

Combine like terms: -350 + 350 = 0
0 + 5x + x2 = 0 + 350
5x + x2 = 0 + 350

Combine like terms: 0 + 350 = 350
5x + x2 = 350

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 350 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 350 + 6.25

Combine like terms: 350 + 6.25 = 356.25
6.25 + 5x + x2 = 356.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 356.25

Calculate the square root of the right side: 18.874586088

Break this problem into two subproblems by setting 
(x + 2.5) equal to 18.874586088 and -18.874586088.

Subproblem 1

x + 2.5 = 18.874586088 Simplifying x + 2.5 = 18.874586088 Reorder the terms: 2.5 + x = 18.874586088 Solving 2.5 + x = 18.874586088 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 18.874586088 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 18.874586088 + -2.5 x = 18.874586088 + -2.5 Combine like terms: 18.874586088 + -2.5 = 16.374586088 x = 16.374586088 Simplifying x = 16.374586088

Subproblem 2

x + 2.5 = -18.874586088 Simplifying x + 2.5 = -18.874586088 Reorder the terms: 2.5 + x = -18.874586088 Solving 2.5 + x = -18.874586088 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -18.874586088 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -18.874586088 + -2.5 x = -18.874586088 + -2.5 Combine like terms: -18.874586088 + -2.5 = -21.374586088 x = -21.374586088 Simplifying x = -21.374586088

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.374586088, -21.374586088}

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