Question

Which of the following is equivalent to 81k2 - 64? a) (9 +8k)(9-8k) b) (9 + 4k)(9 - 4k) c) (9k +8)(9k-8) d) (9k + 4)(9k - 4)​

Answer 1

Answer:

c

Step-by-step explanation:

Formula is (a+b)(a-b) = a2-b²

Hence, option c is the answer

Answer 2

Step-by-step explanation:

(9k+8)(9k-8)

(9k)(9k)=81k2

(+×-)= -

(8×8)=64

81k2-64