Question 429598
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Hi
(2a+5)^3
(2a+5)(2a+5)(2a+5)
(2a+5)(4a^2 + 20a + 25)
2a(4a^2 + 20a + 25) + 5(4a^2 + 20a + 25)
 8a^3 + 60a^2 + 150a + 625

CHECKING our Answer***with the bionomial expansion formula for n=3
In General: (x+y)^3 = x^3 + 3(x^2)y + 3xy^2 + y^3

 (2a+5)^3 = (2a)^3 + 3(2a)^2*5 + + 3(2a)(5^2) + 5^3 
               8a^3  + 60a^2     + 150a       + 625