Solve this: (3x+1)(3x-1)(3x+2)(3x-2)

Asked by zimmylalwani9363.9sdatl | 17th Jun, 2020, 12:57: PM

Expert Answer:

(3x+1)(3x-1)(3x+2)(3x-2)
= (9x2 - 1)(9x2 - 4)    ...  [Using the identity (a2 - b2) = (a+b)(a-b)]
= (9x2)2 - 4 x 9x2 - 9x2 + 4
= (9x2)2 - 36x2 - 9x2 + 4
= 81x4 - 45x2 + 4

Answered by Renu Varma | 18th Jun, 2020, 11:48: AM