(x+5)(x-3)+(x+7)(x-3)=0

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Solution for (x+5)(x-3)+(x+7)(x-3)=0 equation:


Simplifying
(x + 5)(x + -3) + (x + 7)(x + -3) = 0

Reorder the terms:
(5 + x)(x + -3) + (x + 7)(x + -3) = 0

Reorder the terms:
(5 + x)(-3 + x) + (x + 7)(x + -3) = 0

Multiply (5 + x) * (-3 + x)
(5(-3 + x) + x(-3 + x)) + (x + 7)(x + -3) = 0
((-3 * 5 + x * 5) + x(-3 + x)) + (x + 7)(x + -3) = 0
((-15 + 5x) + x(-3 + x)) + (x + 7)(x + -3) = 0
(-15 + 5x + (-3 * x + x * x)) + (x + 7)(x + -3) = 0
(-15 + 5x + (-3x + x2)) + (x + 7)(x + -3) = 0

Combine like terms: 5x + -3x = 2x
(-15 + 2x + x2) + (x + 7)(x + -3) = 0

Reorder the terms:
-15 + 2x + x2 + (7 + x)(x + -3) = 0

Reorder the terms:
-15 + 2x + x2 + (7 + x)(-3 + x) = 0

Multiply (7 + x) * (-3 + x)
-15 + 2x + x2 + (7(-3 + x) + x(-3 + x)) = 0
-15 + 2x + x2 + ((-3 * 7 + x * 7) + x(-3 + x)) = 0
-15 + 2x + x2 + ((-21 + 7x) + x(-3 + x)) = 0
-15 + 2x + x2 + (-21 + 7x + (-3 * x + x * x)) = 0
-15 + 2x + x2 + (-21 + 7x + (-3x + x2)) = 0

Combine like terms: 7x + -3x = 4x
-15 + 2x + x2 + (-21 + 4x + x2) = 0

Reorder the terms:
-15 + -21 + 2x + 4x + x2 + x2 = 0

Combine like terms: -15 + -21 = -36
-36 + 2x + 4x + x2 + x2 = 0

Combine like terms: 2x + 4x = 6x
-36 + 6x + x2 + x2 = 0

Combine like terms: x2 + x2 = 2x2
-36 + 6x + 2x2 = 0

Solving
-36 + 6x + 2x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-18 + 3x + x2) = 0

Factor a trinomial.
2((-6 + -1x)(3 + -1x)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-6 + -1x)' equal to zero and attempt to solve: Simplifying -6 + -1x = 0 Solving -6 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -1x = 0 + 6 Combine like terms: -6 + 6 = 0 0 + -1x = 0 + 6 -1x = 0 + 6 Combine like terms: 0 + 6 = 6 -1x = 6 Divide each side by '-1'. x = -6 Simplifying x = -6

Subproblem 2

Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3

Solution

x = {-6, 3}

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