The circle below is centered at the point (1,2) and has a radius of length 3. What is it’s equation?

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in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: