Question

factorise this expression
c²−81

Answer 1

Step-by-step explanation:

c²-81 = (c-9)(c+9)

because

a²-b²= (a-b)(a+b)

Answer 2

Step-by-step explanation:

c²-81 =(c-9)(c+9)

because

a²-b²=(a-b)(a+b)

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