I don't understand how to solve this

9x^2 - 16 = 0

You will be solving for X. x = 4/9

Step-by-step explanation:

You start by adding 16 to both sides.

then you have 9x^2 = 16

take the square root of each side

so you are left with 9x=4

then you divide each side by 9 to find the value of x

in this case, x=4/9

(3x-4) (3x+4)

Step-by-step explanation:

a^ 2 - b^ 2 = (a + b) (a - b)

9 x 2 - 16 = (3 x) ^ 2 - (4) ^2

(3 x) ^2 - (4) ^2 = (3 x - 4) (3 x + 4)