SOLUTION: solve the quadratic equation: {{{(x+3)^2=81}}} thanks a lot

Question 51610: solve the quadratic equation:

thanks a lot
Answer by rchill(405) (Show Source): You can put this solution on YOUR website!
Doing it the easy way: Let's take the square root of both sides: , which simplifies to . Because we are squaring the (x+3) though, that means that we could have two solutions, one positive and one negative (. Solving for the first equation, subtract 3 from both sides: , which simplifies to . Now solve for the second equation: , which simplifies to . So there are two solutions for x: 6 and -12. An alternative way of solving is by using the quadratic equation and discriminant.
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