Question

Expand (3x+1)3
using suitable identity .

Answer 1

Answer:

identity will be (a+b)³ = a³ + b³ + 3ab(a+b)

Step-by-step explanation:

(3x+1)³ = 27x³ + 1 + 9x(3x+1)

= 27x³ + 1 + 27x² + 9x

= 27x³ + 27x² + 9x + 1

Answer 2

Answer:

$(3x + 1) ^{3} \\ \\ = (3x) ^{3} + 3(3x) ^{2}(1) + 3(3x)(1)^{2} + (1) ^{3} \\ \\ = 27x ^{3} + 27x ^{2} +9 x + 1 \\ \\ formula \: used \\ \\ (a + b) ^{3} = a ^{3} + 3a ^{2} b + 3ab ^{2} + b ^{3}$

hope it helps uH ✔