SOLUTION: solve by factoring and using the principle of zero products; $x^2-9=0

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: solve by factoring and using the principle of zero products; $x^2-9=0      Log On


   

Question 381673: solve by factoring and using the principle of zero products;
$x^2-9=0
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

factoring

x^2-9=0

(x-3)(x+3) = 0 Note:SUM of the inner product(-3x) and the outer product(3x) = 0

Applying principle of zero products to solve for x

(x-3)=0

  x = 3

(x+3) = 0 

  x = -3