Solve by Factoring (x^2-6x)^2-22(x^2-6x)-135=0

${(x^{2} - 6 x)}^{2} - 22 (x^{2} - 6 x) - 135 = 0$

Step 1

Let $u = x^{2} - 6 x$ . Substitute $u$ for all occurrences of $x^{2} - 6 x$ .

$u^{2} - 22 u - 135 = 0$

Step 2

Factor $u^{2} - 22 u - 135$ 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 $- 135$ and whose sum is $- 22$ .

$- 27, 5$

Write the factored form using these integers.

$(u - 27) (u + 5) = 0$

Step 3

Replace all occurrences of $u$ with $x^{2} - 6 x$ .

$(x^{2} - 6 x - 27) (x^{2} - 6 x + 5) = 0$

Step 4

Factor $x^{2} - 6 x - 27$ 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 $- 27$ and whose sum is $- 6$ .

$- 9, 3$

Write the factored form using these integers.

$(x - 9) (x + 3) (x^{2} - 6 x + 5) = 0$

Step 5

Factor.

Factor $x^{2} - 6 x + 5$ 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 $5$ and whose sum is $- 6$ .

$- 5, - 1$

Write the factored form using these integers.

$(x - 9) (x + 3) ((x - 5) (x - 1)) = 0$

Remove unnecessary parentheses.

$(x - 9) (x + 3) (x - 5) (x - 1) = 0$

Step 6

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

$x - 9 = 0$

$x + 3 = 0$

$x - 5 = 0$

$x - 1 = 0$

Step 7

Set $x - 9$ equal to $0$ and solve for $x$ .

Set $x - 9$ equal to $0$ .

$x - 9 = 0$

Add $9$ to both sides of the equation.

$x = 9$

Step 8

Set $x + 3$ equal to $0$ and solve for $x$ .

Set $x + 3$ equal to $0$ .

$x + 3 = 0$

Subtract $3$ from both sides of the equation.

$x = - 3$

Step 9

Set $x - 5$ equal to $0$ and solve for $x$ .

Set $x - 5$ equal to $0$ .

$x - 5 = 0$

Add $5$ to both sides of the equation.

$x = 5$

Step 10

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

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

$x - 1 = 0$

Add $1$ to both sides of the equation.

$x = 1$

Step 11

The final solution is all the values that make $(x - 9) (x + 3) (x - 5) (x - 1) = 0$ true.

$x = 9, - 3, 5, 1$

Solve by Factoring (x^2-6x)^2-22(x^2-6x)-135=0

Related Questions

Support LCMGCF.com by disabling your adblocker.