Question

Write the following cubes in expanded form:
(i) (2x + 1)2
(ii) (20 – 3b)
(​

Answer 1

Answer:

you have to use the identities here

Step-by-step explanation:

In the first one (2x+1)^2 you have to use x^2+2xy+y^2

= so here x=2x and y=1

so,identity can be applied as 2x^2+2×2x×1+1^2

=4x^2+4x+1(final answer)

while in the second one you can use x^2-2xy+y^2(only sign is been changed but formula is same)

Answer 2

Answer:

hope u like it bro .. this is youranswer