Use the quadratic formula to slove 9x^2-4=0

x = 2/3 or x = - 2/3

Step-by-step explanation:

Solve for x:

9 x^2 - 4 = 0

x = (0 ± sqrt (0^2 - 4*9 (-4))) / (2*9) = (± sqrt (144)) / 18:

x = sqrt (144) / 18 or x = (-sqrt (144)) / 18

sqrt (144) = sqrt (16*9) = sqrt (2^4*3^2) = 4*3 = 12:

x = 12/18 or x = (-12) / 18

12/18 = 2/3:

x = 2/3 or x = (-12) / 18

(-12) / 18 = - 2/3:

Answer: x = 2/3 or x = - 2/3