x^2 + 12x+36=16 give exact and approx amount to 3 decimal places. How do you do this problem?

Question

x^2 + 12x+36=16 give exact and approx amount to 3 decimal places.  How do you do this problem?

anonymous · Answer

The first thing you do when you are solving and there is an x^2 term involved is to make it equal to 0.

x^2 + 12x + 20 = 0

anonymous · Answer

then i am supposed to factor it and set the answers = to zero and solve?

anonymous · Answer

In this case you are looking for factors of 20 that add to get 12

1 * 20
2 * 10
4 * 5

the pair that adds to get 12 is the pair you use.... 2 and 10 in this case.

(x + 2)(x + 10) = 0     then you set each one equal to 0 and solve.

x + 2 = 0   or   x + 10 = 0
x = -2    or    x = -10