Question

What is the expansion formulae of (9c-8d)(9c+8d)​

Answer 1

Step-by-step explanation: first you have solve first bracket

like this

9c(9c+8d)-8d(9c+8d)

so answer will be like this

81c^2+72cd-72cd+64d^2

81c^2+cd+64d^2 = ans

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