Question

urgentttt efectuati va rog mult de tot​

Answer 1

c) (3a-4)(3a+4) = 9a la puterea 2 - 16

folosesti formula (a-b)(a+b) = a la puterea 2 - b la puterea 2

d) 5a la puterea 3 ori (5a la puterea 3) la puterea 2  =

5a la puterea 3 ori 5a la puterea 6 = 5a la puterea 9

4) a) 9c la puterea 2 - 49d la puterea 2 = (3c-7d)(3c-7d)

folosesti inversul formulei (a-b)(a+b) = a la puterea 2 - b la puterea 2