Solve for x log base x of x+2=2

$\log_{x} (x + 2) = 2$

Step 1

Rewrite $\log_{x} (x + 2) = 2$ in exponential form using the definition of a logarithm. If $x$ and $b$ are positive real numbers and $b \neq 1$ , then $\log_{b} (x) = y$ is equivalent to $b^{y} = x$ .

$x^{2} = x + 2$

Step 2

Solve for $x$ .

Subtract $x$ from both sides of the equation.

$x^{2} - x = 2$

Subtract $2$ from both sides of the equation.

$x^{2} - x - 2 = 0$

Factor $x^{2} - x - 2$ using the AC method.

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $- 2$ and whose sum is $- 1$ .

$- 2, 1$

Write the factored form using these integers.

$(x - 2) (x + 1) = 0$

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$x - 2 = 0$

$x + 1 = 0$

Set $x - 2$ equal to $0$ and solve for $x$ .

Set $x - 2$ equal to $0$ .

$x - 2 = 0$

Add $2$ to both sides of the equation.

$x = 2$

Set $x + 1$ equal to $0$ and solve for $x$ .

Set $x + 1$ equal to $0$ .

$x + 1 = 0$

Subtract $1$ from both sides of the equation.

$x = - 1$

The final solution is all the values that make $(x - 2) (x + 1) = 0$ true.

$x = 2, - 1$

Step 3

Exclude the solutions that do not make $\log_{x} (x + 2) = 2$ true.

$x = 2$

Solve for x log base x of x+2=2

Related Questions

Support LCMGCF.com by disabling your adblocker.