293

(3a-2)(3a+2)                      (5x-1)(5x+1)                                     m-4n)m+4n)

(10a-b)(10a+b)              (x⁶-y)(x⁶+y)                                         (m-1)(m²+mn+n²)(m+n)(m²-mn+n²)

(3-2c²)(3+2c²)                    (25a⁵-2b)(25a⁵+2b)             (x-y)(x+y)(x²+y²)

296

7                             47

280                         7400

400                        900

900                        4900