Question

2+(2)+2(2)^2-(2)^3. ​

Answer 1

• 2+(2)+2(2)^2-(2)^3.
• 4+2(4)-8
• 4+8-8
• 4, is the required answer.

Answer 2

Step-by-step explanation:

We need to prove that:

2+2

2

...+2

k+1

=2(2

k+1

−1)

LHS=2+2

2

+...+2

k

+2

k+1

=2(2

k

−1)+2

k+1

=2(2

k

−1+2

k

)

=2(2.2

k

−1)

=2(2

k+1

−1)

hope it's helpful