Question

(8x + 9)(8x - 1) using identities....expand

Answer 1

Answer:

64x²- 64x - 9

Step-by-step explanation:

using Identity 4 [ (X+a)(X+b) = x² - {a+b}X + ab ], we get,

(8x)² - (9-1)(8x) + (9)(-1)

= 64x²- 64x - 9

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Answer 2

Step-by-step explanation:

64x²-64x-9 is the correct answer. hope it helps you