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Alina [70]
3 years ago
13

Difference of squares: What is x^2-9=0? please help me....​

Mathematics
2 answers:
Cloud [144]3 years ago
8 0

Answer:

3 or -3

Step-by-step explanation:

You need to factor it to be able to find the solution.

x^2-9=0

(x+3)(x-3)=0  You now need to find 'each' zero, because if one parenthesis equals 0, then you are multiplying the rest of the equation by 0 which will equal 0.

x+3=0  Subtract three

x= -3    

x-3=0  Add three

x= 3

x^2-9 will equal 0 when x is either +3 or -3

nevsk [136]3 years ago
8 0

Answer:

x=3  x=-3

Step-by-step explanation:

x^2-9=0

We know this is the difference of squares

a^2 - b^2 = (a-b) (a+b)

(x-3)(x+3) =0

Using the zero product property

x-3 =0  x+3 =0

x=3  x=-3

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A BMW that cost $71,000 in 2003 depreciates in value about 15% a year. How much was it worth in 2013?
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3 years ago
3 pounds cost $15. How many pounds can you buy for $45?
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6 0
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Please help im stuck on this one i font know how to do inverse operarions​
Goshia [24]

Answer:

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Step-by-step explanation:

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5 0
3 years ago
Mary took out a loan to buy a $30,000 boat but had $2,000 cash to put down.Which of the following is true? a. Mary decreased bot
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Answer: The answer is (b) Mary increased both assets and liabilities.


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As a result, Mary took the loan for $28,000 to buy the boat. This will add one more number to the number of Mary's assets and also add one more number to the number of liabilities Mary has.

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3 years ago
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