ACT Math : Factoring Common Factors of Squares and Square Roots

Study concepts, example questions & explanations for ACT Math

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Example Questions

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Example Question #1 :How To Find The Common Factor Of Square Roots

Possible Answers:

Correct answer:

Explanation:

To solve the equation, we can first factor the numbers under the square roots.

When a factor appears twice, we can take it out of the square root.

Now the numbers can be added directly because the expressions under the square roots match.

Example Question #2 :How To Find The Common Factor Of Square Roots

Solve for.

Possible Answers:

Correct answer:

Explanation:

First, we can simplify the radicals by factoring.

Now, we can factor out the.

Now divide and simplify.

Example Question #2 :How To Find The Common Factor Of Square Roots

Which of the following is equivalent to:

?

Possible Answers:

Correct answer:

Explanation:

To begin with, factor out the contents of the radicals. This will make answering much easier:

They both have a common factor. This means that you could rewrite your equation like this:

This is the same as:

These have a common. Therefore, factor that out:

Example Question #1 :How To Find The Common Factor Of Square Roots

Simplify:

Possible Answers:

Correct answer:

Explanation:

These three roots all have ain common; therefore, you can rewrite them:

Now, this could be rewritten:

Now, note that

Therefore, you can simplify again:

Now, that looks messy! Still, if you look carefully, you see that all of your factors have; therefore, factor that out:

This is the same as:

Example Question #3 :How To Find The Common Factor Of Square Roots

Simplify:

Possible Answers:

Correct answer:

Explanation:

Begin by factoring out the relevant squared data:

is the same as

This can be simplified to:

Since your various factors contain square roots of, you can simplify:

Technically, you can factor out a:

Example Question #1 :Basic Squaring / Square Roots

Solve for:

Possible Answers:

Correct answer:

Explanation:

Begin by breaking apart the square roots on the left side of the equation:

This can be rewritten:

You can combine like terms on the left side:

Solve by dividing both sides by:

This simplifies to:

Example Question #1 :Basic Squaring / Square Roots

Solve for:

Possible Answers:

Correct answer:

Explanation:

To begin solving this problem, find the greatest common perfect square for all quantities under a radical.

--->

Pullout of each term on the left:

--->

Next, factor outfrom the left-hand side:

--->

Lastly, isolate:

--->

Example Question #6 :How To Find The Common Factor Of Square Roots

Solve for:

Possible Answers:

Correct answer:

Explanation:

Solving this one is tricky. At first glance, we have no common perfect square to work with. But since each term can produce the quantity, let's start there:

--->

Simplify the first term:

--->

Divide all terms byto simplify,

--->

Next, factor outfrom the left-hand side:

--->

Isolateby dividing byand simplifying:

--->

Last, simplify the denominator:

---->

Example Question #7 :How To Find The Common Factor Of Square Roots

Solve for:

Possible Answers:

Correct answer:

Explanation:

Right away, we notice thatis a prime radical, so no simplification is possible. Note, however, that both other radicals are divisible by.

Our first step then becomes simplifying the equation by dividing everything by:

--->

Next, factor outfrom the left-hand side:

--->

Lastly, isolate:

--->

Example Question #8 :How To Find The Common Factor Of Square Roots

Solve for:

Possible Answers:

Correct answer:

Explanation:

Once again, there are no common perfect squares under the radical, but with some simplification, the equation can still be solved for:

--->

Simplify:

--->

Factor outfrom the left-hand side:

--->

Lastly, isolate:

--->

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