Question

(1) (2m - 5)³ expand
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Answer 1

Answer:

Using the identity(a-b)^3= a^ 3-b^3 -3a^2b+3ab^2a= 2m b= 5(2m-5)^3= (2m )³ - 5³ - 3 x (2m )² x 5 + 3 x 2m x 5²= 8m³- 125 .

Answer 2

Step-by-step explanation:

(a-b)^3 = a^3 - b^3 - 3ab( a - b)

(2m - 5)^3 = (2m)^3 - 5^3 - 3(2m)(5)[2m - 5]

                =  8m^3 - 125 - 30m[2m - 5]

                =  8m^3 - 125 - 60m^2 + 150m