ln(x)+ln(x-4)=ln(7x)

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Solution for ln(x)+ln(x-4)=ln(7x) equation:


Simplifying
ln(x) + ln(x + -4) = ln(7x)

Multiply ln * x
lnx + ln(x + -4) = ln(7x)

Reorder the terms:
lnx + ln(-4 + x) = ln(7x)
lnx + (-4 * ln + x * ln) = ln(7x)
lnx + (-4ln + lnx) = ln(7x)

Reorder the terms:
-4ln + lnx + lnx = ln(7x)

Combine like terms: lnx + lnx = 2lnx
-4ln + 2lnx = ln(7x)

Remove parenthesis around (7x)
-4ln + 2lnx = ln * 7x

Reorder the terms for easier multiplication:
-4ln + 2lnx = 7ln * x

Multiply ln * x
-4ln + 2lnx = 7lnx

Solving
-4ln + 2lnx = 7lnx

Solving for variable 'l'.

Move all terms containing l to the left, all other terms to the right.

Add '-7lnx' to each side of the equation.
-4ln + 2lnx + -7lnx = 7lnx + -7lnx

Combine like terms: 2lnx + -7lnx = -5lnx
-4ln + -5lnx = 7lnx + -7lnx

Combine like terms: 7lnx + -7lnx = 0
-4ln + -5lnx = 0

Factor out the Greatest Common Factor (GCF), '-1ln'.
-1ln(4 + 5x) = 0

Ignore the factor -1.

Subproblem 1

Set the factor 'ln' equal to zero and attempt to solve: Simplifying ln = 0 Solving ln = 0 Move all terms containing l to the left, all other terms to the right. Simplifying ln = 0 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 2

Set the factor '(4 + 5x)' equal to zero and attempt to solve: Simplifying 4 + 5x = 0 Solving 4 + 5x = 0 Move all terms containing l to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 5x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 5x = 0 + -4 5x = 0 + -4 Combine like terms: 0 + -4 = -4 5x = -4 Add '-5x' to each side of the equation. 5x + -5x = -4 + -5x Combine like terms: 5x + -5x = 0 0 = -4 + -5x Simplifying 0 = -4 + -5x The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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