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How do you solve # x^2-9=0#?

Answer 1

Savannah Anderson

#x=+-3#

#=>x^2-9=0# #=>x^2=9# #=>x=sqrt9#

#=>x=sqrt (3^2)# #=>x=3#

#=>x=sqrt ((-3)^2)# #=>x=-3#

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Answer 2

Julia Adams

To solve the equation ( x^2 - 9 = 0 ), you can use the method of factoring the quadratic expression or applying the square root property. Factoring the expression gives ((x - 3)(x + 3) = 0). Then, setting each factor equal to zero gives (x - 3 = 0) or (x + 3 = 0). Solving these equations gives (x = 3) or (x = -3), so the solutions are (x = 3) and (x = -3).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.