# ACT Math : Factoring Squares

## Example Questions

### Example Question #12 : Squaring / Square Roots / Radicals

Which real number satisfies ?

Explanation:

Simplify the base of 9 and 27 in order to have a common base.

(3x)(9)=272

= (3x)(32)=(33)2

=(3x+2)=36

Therefore:

x+2=6

x=4

### Example Question #13 : Squaring / Square Roots / Radicals

Which of the following is a factor of  ?

Explanation:

The terms of  have  as their greatest common factor, so

is a prime polynomial.

Of the five choices, only  is a factor.

### Example Question #14 : Squaring / Square Roots / Radicals

Simplify

Explanation:

The easiest way to approach this problem is to break everything into exponents.  is equal to  and 27 is equal to . Therefore, the expression can be broken down into . When you cancel out all the terms, you get , which equals .

### Example Question #8 : Squaring / Square Roots / Radicals

Which of the following expression is equal to

Explanation:

When simplifying a square root, consider the factors of each of its component parts:

Combine like terms:

Remove the common factor, :

Pull the  outside of the equation as :

### Example Question #9 : Squaring / Square Roots / Radicals

Which of the following is equal to the following expression?

Explanation:

First, break down the components of the square root:

Combine like terms. Remember, when multiplying exponents, add them together:

Factor out the common factor of :

Factor the :

Combine the factored  with the :

Now, you can pull  out from underneath the square root sign as :

### Example Question #10 : Squaring / Square Roots / Radicals

Which of the following expressions is equal to the following expression?

Explanation:

First, break down the component parts of the square root:

Combine like terms in a way that will let you pull some of them out from underneath the square root symbol:

Pull out the terms with even exponents and simplify:

### Example Question #15 : Squaring / Square Roots / Radicals

What is,

?

Explanation:

To find an equivalency we must rationalize the denominator.

To rationalize the denominator multiply the numerator and denominator by the denominator.

Factor out 6,

Extract perfect square 9 from the square root of 18.