Question

please help me

Write the following cubes in expanded form. a) (2x+ 4)³ b) (4a – 5b)³​​

Answer 1

Answer:

1. (2x)³+4³+3(2x)(4)(2x+4)

=8x³+64+24x(2x+4)

=8x³+48x²+96x+64

2. (4a)³+(-5b)³-3(4a)(-5b)(4a-5b)

= 64a³-125b³+60ab(4a-5b)

=64a³-125b³+240a²b-300ab²

Hope it helps dear.

Answer 2

Answer:

a) (2x+4)^3

Identity: a^3+b^3+3ab(a+b)

(2x)^3+(4)^3+3(2x)(4)(2x+4)

8x^3+64+24x(2x+4)

8x^3+64+48x^2+96x-Ans

b) (4a-5b)^3

Id:a^3-b^3-3ab(a+b)

(4a)^3-(5b)^3-3(4a)(5b)(4a+5b)

64a^3-125b^3-60ab(4a+5b)

64a^3-125b^3-240a^2b+300ab^2-Ans

Mark me as brainliest please!