Factor 49x^2-7^2
and please explain how

Step-by-step explanation:

Factoring

We need to recall this property of binomials:

It allows us to factor the difference between two squares as follows.

The given expression is

Comparing with the above expression:

Taking square root:

Taking square root:

b=7

Factoring:

Now we can see each factor can be taken out the common factor 7:

Multiplying:

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the answer is b.)

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