Question

Find all values of x for which the given statement is true.
|x^2 +9| = x^2 + 9

Help needed.

Answer 1

still there?

Answer 2

yes

Answer 3

you there?

Answer 4

first question, what does absolute value means?

Answer 5

non negative value without regard to the sign, right?

Answer 6

yeah

Answer 7

so just continue with the usual algebra. But replace negatives with positives.

Answer 8

can you do the first step for me, please?

Answer 9

w8

Answer 10

okay

Answer 11

http://www.wolframalpha.com/input/?i=%7Cx%5E2%2B9%7C%3Dx%5E2%2B9

Answer 12

i can't get it :/

Answer 13

hint: x^2+9 is always positive