Question

hi help i need your help please on copy​

Answer 1

Step-by-step explanation:

Question (3)

(a) a³+1/a³

Answer: a+1/a=7(a2+1)/a

7a2-7a+1

=0 Ans.

Question (5)

* x²+1/x²= (x+1/x)²=x²+1/x²+2x

(x+1/x)²- 2=7

(x+1/x)²=9

x+1/x= 3 ( Only + be value taken)

*x³+1/x³= (x+1/x)³- 3x²(1/x) -3x(1/x²)

(x+1/x)³-3(x+1/x)

(3)³-3 (3)

27-9

=18 Ans.