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4 years ago

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

Mathematics

2 answers:

Cloud [144]4 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]4 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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Step-by-step explanation:

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3 years ago

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

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