Question

please solve the 6th question .I will mark as brain liest

Answer 1

( 2x + 1 )^3

(2x)^3 + (1)^3 + 3*1*2x(2x + 1 )

8x^3 + 1 + 6x ( 2x + 1 )

8x^3 + 1 + 12 x^2 + 6x

Answer 2

here os your answer
in question no
(i) (2x+1)^3

as we know that (x+y)^2 = x^3+y^2+3xy (x+y)

and comparing the given question to this formula
(2x)^3+(1)^3+6x (2x+1)
8x^3+1+12x^2 +6x
8x^3+12x^2+6x+1


(ii) (ii) (2a−3b)3

(2a−3b)3= (2a)3−(3b)3–(3×2a×3b)(2a–3b)
=8a3–27b3–18ab(2a–3b)=
8a3–27b3–36a2b+54ab2