To factor 9x^2-4 you can first rewrite the expression as:

(3x-2)(3x+2)

Step-by-step explanation: this is because 9x^2 and 4 is a perfect square. So the square root of 9x^2 is 3x and because the 4 is negative you have to times 3x by a negative and positive 2.

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

Step-by-step explanation:

A P E X answer

step-by-step explanation:

f(gx)=f(1/x+2)

=(1/x+2)+2

=(1+2x)/2+2

=(1+2x+4)/2

= (2x+5)/2